256497275 has 12 divisors (see below), whose sum is σ = 336766392. Its totient is φ = 193127040.

The previous prime is 256497251. The next prime is 256497287. The reversal of 256497275 is 572794652.

It is not a de Polignac number, because 256497275 - 2⁶ = 256497211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301337 + ... + 302186.

It is an arithmetic number, because the mean of its divisors is an integer number (28063866).

Almost surely, 2^256497275 is an apocalyptic number.

256497275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256497275 is a deficient number, since it is larger than the sum of its proper divisors (80269117).

256497275 is a wasteful number, since it uses less digits than its factorization.

256497275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603550 (or 603545 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 47.

The square root of 256497275 is about 16015.5323046098. The cubic root of 256497275 is about 635.3712876070.

The spelling of 256497275 in words is "two hundred fifty-six million, four hundred ninety-seven thousand, two hundred seventy-five".