256415830 has 64 divisors (see below), whose sum is σ = 537062400. Its totient is φ = 87160320.

The previous prime is 256415821. The next prime is 256415843. The reversal of 256415830 is 38514652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164334 + ... + 165886.

It is an arithmetic number, because the mean of its divisors is an integer number (8391600).

Almost surely, 2^256415830 is an apocalyptic number.

256415830 is an abundant number, since it is smaller than the sum of its proper divisors (280646570).

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

256415830 is a wasteful number, since it uses less digits than its factorization.

256415830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 256415830 is about 16012.9894148469. The cubic root of 256415830 is about 635.3040311516.

The spelling of 256415830 in words is "two hundred fifty-six million, four hundred fifteen thousand, eight hundred thirty".