256908860940 has 48 divisors (see below), whose sum is σ = 722754063360. Its totient is φ = 68184338880.

The previous prime is 256908860917. The next prime is 256908861049. The reversal of 256908860940 is 49068809652.

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, 10133820 + ... + 10159139.

It is an arithmetic number, because the mean of its divisors is an integer number (15057376320).

Almost surely, 2^256908860940 is an apocalyptic number.

256908860940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256908860940 is an abundant number, since it is smaller than the sum of its proper divisors (465845202420).

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

256908860940 is a wasteful number, since it uses less digits than its factorization.

256908860940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20293182 (or 20293180 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 256908860940 in words is "two hundred fifty-six billion, nine hundred eight million, eight hundred sixty thousand, nine hundred forty".