256692307980 has 24 divisors (see below), whose sum is σ = 718738462512. Its totient is φ = 68451282112.

The previous prime is 256692307979. The next prime is 256692308011. The reversal of 256692307980 is 89703296652.

It is a self number, because there is not a number n which added to its sum of digits gives 256692307980.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2139102507 + ... + 2139102626.

It is an arithmetic number, because the mean of its divisors is an integer number (29947435938).

Almost surely, 2^256692307980 is an apocalyptic number.

256692307980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256692307980 is an abundant number, since it is smaller than the sum of its proper divisors (462046154532).

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

256692307980 is a wasteful number, since it uses less digits than its factorization.

256692307980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278205145 (or 4278205143 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 256692307980 in words is "two hundred fifty-six billion, six hundred ninety-two million, three hundred seven thousand, nine hundred eighty".