256709367888 has 40 divisors (see below), whose sum is σ = 681089273568. Its totient is φ = 83257091712.

The previous prime is 256709367883. The next prime is 256709367907. The reversal of 256709367888 is 888763907652.

It is a super-2 number, since 2×256709367888² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256709367883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72270006 + ... + 72273557.

Almost surely, 2^256709367888 is an apocalyptic number.

It is an amenable number.

256709367888 is an abundant number, since it is smaller than the sum of its proper divisors (424379905680).

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

256709367888 is a wasteful number, since it uses less digits than its factorization.

256709367888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144543611 (or 144543605 counting only the distinct ones).

The product of its (nonzero) digits is 243855360, while the sum is 69.

The spelling of 256709367888 in words is "two hundred fifty-six billion, seven hundred nine million, three hundred sixty-seven thousand, eight hundred eighty-eight".