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71939070 = 23357172239
BaseRepresentation
bin1000100100110…
…11001111111110
312000100212212000
410102123033332
5121404022240
611045523130
71532320620
oct422331776
9160325760
1071939070
1137675985
12201134a6
1311b9a2c8
1497a8c10
1564b0430
hex449b3fe

71939070 has 128 divisors (see below), whose sum is σ = 232243200. Its totient is φ = 15469056.

The previous prime is 71939057. The next prime is 71939071. The reversal of 71939070 is 7093917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71939071) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31011 + ... + 33249.

It is an arithmetic number, because the mean of its divisors is an integer number (1814400).

Almost surely, 271939070 is an apocalyptic number.

71939070 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 71939070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116121600).

71939070 is an abundant number, since it is smaller than the sum of its proper divisors (160304130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71939070 is a wasteful number, since it uses less digits than its factorization.

71939070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279 (or 2273 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 71939070 is about 8481.6902796553. The cubic root of 71939070 is about 415.8993800963.

The spelling of 71939070 in words is "seventy-one million, nine hundred thirty-nine thousand, seventy".

Divisors: 1 2 3 5 6 7 9 10 14 15 17 18 21 27 30 34 35 42 45 51 54 63 70 85 90 102 105 119 126 135 153 170 189 210 238 255 270 306 315 357 378 459 510 595 630 714 765 918 945 1071 1190 1530 1785 1890 2142 2239 2295 3213 3570 4478 4590 5355 6426 6717 10710 11195 13434 15673 16065 20151 22390 31346 32130 33585 38063 40302 47019 60453 67170 76126 78365 94038 100755 114189 120906 141057 156730 190315 201510 228378 235095 266441 282114 302265 342567 380630 423171 470190 532882 570945 604530 685134 705285 799323 846342 1027701 1141890 1332205 1410570 1598646 1712835 2055402 2115855 2397969 2664410 3425670 3996615 4231710 4795938 5138505 7193907 7993230 10277010 11989845 14387814 23979690 35969535 71939070