256642776 has 64 divisors (see below), whose sum is σ = 767743200. Its totient is φ = 78966144.

The previous prime is 256642759. The next prime is 256642783. The reversal of 256642776 is 677246652.

256642776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 42891 + ... + 48506.

Almost surely, 2^256642776 is an apocalyptic number.

256642776 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

256642776 is an abundant number, since it is smaller than the sum of its proper divisors (511100424).

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

256642776 is a wasteful number, since it uses less digits than its factorization.

256642776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91425 (or 91415 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 256642776 is about 16020.0741571317. The cubic root of 256642776 is about 635.4914054298.

The spelling of 256642776 in words is "two hundred fifty-six million, six hundred forty-two thousand, seven hundred seventy-six".