256997154 has 64 divisors (see below), whose sum is σ = 560102400. Its totient is φ = 78345792.

The previous prime is 256997141. The next prime is 256997171. The reversal of 256997154 is 451799652.

It is a Curzon 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, 504652 + ... + 505160.

It is an arithmetic number, because the mean of its divisors is an integer number (8751600).

Almost surely, 2^256997154 is an apocalyptic number.

256997154 is an abundant number, since it is smaller than the sum of its proper divisors (303105246).

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

256997154 is a wasteful number, since it uses less digits than its factorization.

256997154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679.

The product of its digits is 680400, while the sum is 48.

The square root of 256997154 is about 16031.1307773345. The cubic root of 256997154 is about 635.7837710811.

The spelling of 256997154 in words is "two hundred fifty-six million, nine hundred ninety-seven thousand, one hundred fifty-four".