256732686724 has 12 divisors (see below), whose sum is σ = 449285996124. Its totient is φ = 128365259264.

The previous prime is 256732686677. The next prime is 256732686781. The reversal of 256732686724 is 427686237652.

It can be written as a sum of positive squares in 2 ways, for example, as 193388857600 + 63343829124 = 439760^2 + 251682^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515292 + ... + 882604.

It is an arithmetic number, because the mean of its divisors is an integer number (37440499677).

Almost surely, 2^256732686724 is an apocalyptic number.

It is an amenable number.

256732686724 is a deficient number, since it is larger than the sum of its proper divisors (192553309400).

256732686724 is a wasteful number, since it uses less digits than its factorization.

256732686724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542054 (or 542052 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 58.

The spelling of 256732686724 in words is "two hundred fifty-six billion, seven hundred thirty-two million, six hundred eighty-six thousand, seven hundred twenty-four".