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309073472 = 2631155783
BaseRepresentation
bin10010011011000…
…001011001000000
3210112120120002122
4102123001121000
51113110322342
650400303412
710442036561
oct2233013100
9715516078
10309073472
11149511524
1287611b68
134c056a16
142d096168
151c2024d2
hex126c1640

309073472 has 28 divisors (see below), whose sum is σ = 633106176. Its totient is φ = 149550720.

The previous prime is 309073421. The next prime is 309073477. The reversal of 309073472 is 274370903.

It is a super-2 number, since 2×3090734722 = 191052822188269568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (309073477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75908 + ... + 79875.

Almost surely, 2309073472 is an apocalyptic number.

309073472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

309073472 is an abundant number, since it is smaller than the sum of its proper divisors (324032704).

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

309073472 is a wasteful number, since it uses less digits than its factorization.

309073472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155826 (or 155816 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 309073472 is about 17580.4855450582. The cubic root of 309073472 is about 676.1150090843.

The spelling of 309073472 in words is "three hundred nine million, seventy-three thousand, four hundred seventy-two".

Divisors: 1 2 4 8 16 31 32 62 64 124 248 496 992 1984 155783 311566 623132 1246264 2492528 4829273 4985056 9658546 9970112 19317092 38634184 77268368 154536736 309073472