1256704872 has 32 divisors (see below), whose sum is σ = 3326572800. Its totient is φ = 394260224.

The previous prime is 1256704871. The next prime is 1256704913. The reversal of 1256704872 is 2784076521.

It is not an unprimeable number, because it can be changed into a prime (1256704871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1539672 + ... + 1540487.

It is an arithmetic number, because the mean of its divisors is an integer number (103955400).

Almost surely, 2^1256704872 is an apocalyptic number.

1256704872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1256704872 is an abundant number, since it is smaller than the sum of its proper divisors (2069867928).

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

1256704872 is a wasteful number, since it uses less digits than its factorization.

1256704872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080185 (or 3080181 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 1256704872 is about 35450.0334555554. The cubic root of 1256704872 is about 1079.1399394132.

The spelling of 1256704872 in words is "one billion, two hundred fifty-six million, seven hundred four thousand, eight hundred seventy-two".