256915285 has 16 divisors (see below), whose sum is σ = 338982912. Its totient is φ = 185371200.

The previous prime is 256915277. The next prime is 256915291. The reversal of 256915285 is 582519652.

It is not a de Polignac number, because 256915285 - 2³ = 256915277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11406 + ... + 25375.

It is an arithmetic number, because the mean of its divisors is an integer number (21186432).

Almost surely, 2^256915285 is an apocalyptic number.

It is an amenable number.

256915285 is a deficient number, since it is larger than the sum of its proper divisors (82067627).

256915285 is a wasteful number, since it uses less digits than its factorization.

256915285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36924.

The product of its digits is 216000, while the sum is 43.

The square root of 256915285 is about 16028.5771358533. The cubic root of 256915285 is about 635.7162521627.

It can be divided in two parts, 25691 and 5285, that added together give a square (30976 = 176²).

The spelling of 256915285 in words is "two hundred fifty-six million, nine hundred fifteen thousand, two hundred eighty-five".