257800830 has 64 divisors (see below), whose sum is σ = 726243840. Its totient is φ = 57331584.

The previous prime is 257800819. The next prime is 257800847. The reversal of 257800830 is 38008752.

It is a super-2 number, since 2×257800830² = 132922535897377800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 257800791 and 257800800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8820 + ... + 24359.

It is an arithmetic number, because the mean of its divisors is an integer number (11347560).

Almost surely, 2^257800830 is an apocalyptic number.

257800830 is an abundant number, since it is smaller than the sum of its proper divisors (468443010).

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

257800830 is a wasteful number, since it uses less digits than its factorization.

257800830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33233.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 257800830 is about 16056.1773159118. The cubic root of 257800830 is about 636.4458179146.

The spelling of 257800830 in words is "two hundred fifty-seven million, eight hundred thousand, eight hundred thirty".