256772331 has 6 divisors (see below), whose sum is σ = 370893380. Its totient is φ = 171181548.

The previous prime is 256772239. The next prime is 256772339. The reversal of 256772331 is 133277652.

256772331 is a `hidden beast` number, since 256 + 7 + 72 + 331 = 666.

It is not a de Polignac number, because 256772331 - 2⁹ = 256771819 is a prime.

It is a super-2 number, since 2×256772331² = 131864059934347122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256772339) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14265121 + ... + 14265138.

Almost surely, 2^256772331 is an apocalyptic number.

256772331 is a deficient number, since it is larger than the sum of its proper divisors (114121049).

256772331 is a wasteful number, since it uses less digits than its factorization.

256772331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28530265 (or 28530262 counting only the distinct ones).

The product of its digits is 52920, while the sum is 36.

The square root of 256772331 is about 16024.1171675696. The cubic root of 256772331 is about 635.5983208869.

The spelling of 256772331 in words is "two hundred fifty-six million, seven hundred seventy-two thousand, three hundred thirty-one".