256825590 has 64 divisors (see below), whose sum is σ = 735077376. Its totient is φ = 56149632.

The previous prime is 256825529. The next prime is 256825649. The reversal of 256825590 is 95528652.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 21757 + ... + 31416.

It is an arithmetic number, because the mean of its divisors is an integer number (11485584).

Almost surely, 2^256825590 is an apocalyptic number.

256825590 is an abundant number, since it is smaller than the sum of its proper divisors (478251786).

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

256825590 is a wasteful number, since it uses less digits than its factorization.

256825590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53213.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 256825590 is about 16025.7789202272. The cubic root of 256825590 is about 635.6422625254.

The spelling of 256825590 in words is "two hundred fifty-six million, eight hundred twenty-five thousand, five hundred ninety".