256433590 has 16 divisors (see below), whose sum is σ = 527520672. Its totient is φ = 87920064.

The previous prime is 256433579. The next prime is 256433609. The reversal of 256433590 is 95334652.

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 7 ways as a sum of consecutive naturals, for example, 1831599 + ... + 1831738.

It is an arithmetic number, because the mean of its divisors is an integer number (32970042).

Almost surely, 2^256433590 is an apocalyptic number.

256433590 is an abundant number, since it is smaller than the sum of its proper divisors (271087082).

256433590 is a wasteful number, since it uses less digits than its factorization.

256433590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663351.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 256433590 is about 16013.5439550401. The cubic root of 256433590 is about 635.3186983936.

It can be divided in two parts, 256 and 433590, that added together give a triangular number (433846 = T₉₃₁).

The spelling of 256433590 in words is "two hundred fifty-six million, four hundred thirty-three thousand, five hundred ninety".