256497190 has 64 divisors (see below), whose sum is σ = 503884800. Its totient is φ = 93646336.

The previous prime is 256497187. The next prime is 256497211. The reversal of 256497190 is 91794652.

It is a happy number.

It is a super-2 number, since 2×256497190² = 131581616955792200, which contains 22 as substring.

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, 1073091 + ... + 1073329.

It is an arithmetic number, because the mean of its divisors is an integer number (7873200).

Almost surely, 2^256497190 is an apocalyptic number.

256497190 is a deficient number, since it is larger than the sum of its proper divisors (247387610).

256497190 is a wasteful number, since it uses less digits than its factorization.

256497190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 256497190 is about 16015.5296509357. The cubic root of 256497190 is about 635.3712174223.

The spelling of 256497190 in words is "two hundred fifty-six million, four hundred ninety-seven thousand, one hundred ninety".