257887830 has 32 divisors (see below), whose sum is σ = 627414624. Its totient is φ = 67827456.

The previous prime is 257887829. The next prime is 257887849. The reversal of 257887830 is 38788752.

It is a super-2 number, since 2×257887830² = 133012265724217800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 257887830.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56689 + ... + 61068.

It is an arithmetic number, because the mean of its divisors is an integer number (19606707).

Almost surely, 2^257887830 is an apocalyptic number.

257887830 is an abundant number, since it is smaller than the sum of its proper divisors (369526794).

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

257887830 is a wasteful number, since it uses less digits than its factorization.

257887830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117840.

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 257887830 is about 16058.8863250227. The cubic root of 257887830 is about 636.5174036146.

The spelling of 257887830 in words is "two hundred fifty-seven million, eight hundred eighty-seven thousand, eight hundred thirty".