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81394884 = 223223197499
BaseRepresentation
bin1001101100111…
…11110011000100
312200011021210100
410312133303010
5131314114014
612024324100
72005562604
oct466376304
9180137710
1081394884
1141a441aa
1223313630
1313b2b26c
14ab4ac04
15722c009
hex4d9fcc4

81394884 has 72 divisors (see below), whose sum is σ = 216216000. Its totient is φ = 25768512.

The previous prime is 81394867. The next prime is 81394891. The reversal of 81394884 is 48849318.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162867 + ... + 163365.

It is an arithmetic number, because the mean of its divisors is an integer number (3003000).

Almost surely, 281394884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81394884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108108000).

81394884 is an abundant number, since it is smaller than the sum of its proper divisors (134821116).

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

81394884 is a wasteful number, since it uses less digits than its factorization.

81394884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 724 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 81394884 is about 9021.9113274295. The cubic root of 81394884 is about 433.3768442831.

The spelling of 81394884 in words is "eighty-one million, three hundred ninety-four thousand, eight hundred eighty-four".

Divisors: 1 2 3 4 6 9 12 18 23 36 46 69 92 138 197 207 276 394 414 499 591 788 828 998 1182 1497 1773 1996 2364 2994 3546 4491 4531 5988 7092 8982 9062 11477 13593 17964 18124 22954 27186 34431 40779 45908 54372 68862 81558 98303 103293 137724 163116 196606 206586 294909 393212 413172 589818 884727 1179636 1769454 2260969 3538908 4521938 6782907 9043876 13565814 20348721 27131628 40697442 81394884