256772949 has 16 divisors (see below), whose sum is σ = 344881152. Its totient is φ = 169929008.

The previous prime is 256772941. The next prime is 256772983. The reversal of 256772949 is 949277652.

It is a cyclic number.

It is not a de Polignac number, because 256772949 - 2³ = 256772941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256772941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396544 + ... + 397190.

It is an arithmetic number, because the mean of its divisors is an integer number (21555072).

Almost surely, 2^256772949 is an apocalyptic number.

It is an amenable number.

256772949 is a deficient number, since it is larger than the sum of its proper divisors (88108203).

256772949 is a wasteful number, since it uses less digits than its factorization.

256772949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416.

The product of its digits is 1905120, while the sum is 51.

The square root of 256772949 is about 16024.1364509917. The cubic root of 256772949 is about 635.5988308062.

The spelling of 256772949 in words is "two hundred fifty-six million, seven hundred seventy-two thousand, nine hundred forty-nine".