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30128490 = 2335719839
BaseRepresentation
bin111001011101…
…1100101101010
32002200200112000
41302323211222
530203102430
62553431430
7514042110
oct162734552
962620460
1030128490
1116008a87
12a10b576
13631b612
144003ab0
1529a1e60
hex1cbb96a

30128490 has 128 divisors (see below), whose sum is σ = 96768000. Its totient is φ = 6516288.

The previous prime is 30128489. The next prime is 30128503. The reversal of 30128490 is 9482103.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35491 + ... + 36329.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 230128490 is an apocalyptic number.

30128490 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30128490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48384000).

30128490 is an abundant number, since it is smaller than the sum of its proper divisors (66639510).

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

30128490 is a wasteful number, since it uses less digits than its factorization.

30128490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 30128490 is about 5488.9425211055. The cubic root of 30128490 is about 311.1662279994.

The spelling of 30128490 in words is "thirty million, one hundred twenty-eight thousand, four hundred ninety".

Divisors: 1 2 3 5 6 7 9 10 14 15 18 19 21 27 30 35 38 42 45 54 57 63 70 90 95 105 114 126 133 135 171 189 190 210 266 270 285 315 342 378 399 513 570 630 665 798 839 855 945 1026 1197 1330 1678 1710 1890 1995 2394 2517 2565 3591 3990 4195 5034 5130 5873 5985 7182 7551 8390 11746 11970 12585 15102 15941 17619 17955 22653 25170 29365 31882 35238 35910 37755 45306 47823 52857 58730 75510 79705 88095 95646 105714 111587 113265 143469 158571 159410 176190 223174 226530 239115 264285 286938 317142 334761 430407 478230 528570 557935 669522 717345 792855 860814 1004283 1115870 1434690 1585710 1673805 2008566 2152035 3012849 3347610 4304070 5021415 6025698 10042830 15064245 30128490