257609028 has 12 divisors (see below), whose sum is σ = 601087760. Its totient is φ = 85869672.

The previous prime is 257609017. The next prime is 257609029. The reversal of 257609028 is 820906752.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×257609028² = 132724822614209568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) 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 (257609029) 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, 10733698 + ... + 10733721.

Almost surely, 2^257609028 is an apocalyptic number.

It is an amenable number.

257609028 is an abundant number, since it is smaller than the sum of its proper divisors (343478732).

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

257609028 is a wasteful number, since it uses less digits than its factorization.

257609028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21467426 (or 21467424 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 257609028 is about 16050.2033631976. The cubic root of 257609028 is about 636.2879416880.

The spelling of 257609028 in words is "two hundred fifty-seven million, six hundred nine thousand, twenty-eight".