256916590 has 16 divisors (see below), whose sum is σ = 528514272. Its totient is φ = 88085664.

The previous prime is 256916581. The next prime is 256916593. The reversal of 256916590 is 95619652.

It is a super-2 number, since 2×256916590² = 132012268434456200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256916593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1835049 + ... + 1835188.

It is an arithmetic number, because the mean of its divisors is an integer number (33032142).

Almost surely, 2^256916590 is an apocalyptic number.

256916590 is an abundant number, since it is smaller than the sum of its proper divisors (271597682).

256916590 is a wasteful number, since it uses less digits than its factorization.

256916590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670251.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 256916590 is about 16028.6178443433. The cubic root of 256916590 is about 635.7173285334.

The spelling of 256916590 in words is "two hundred fifty-six million, nine hundred sixteen thousand, five hundred ninety".