256615328280 has 32 divisors (see below), whose sum is σ = 769845985200. Its totient is φ = 68430754176.

The previous prime is 256615328279. The next prime is 256615328293. The reversal of 256615328280 is 82823516652.

It is a super-3 number, since 3×256615328280³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1069230415 + ... + 1069230654.

Almost surely, 2^256615328280 is an apocalyptic number.

256615328280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256615328280 is an abundant number, since it is smaller than the sum of its proper divisors (513230656920).

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

256615328280 is a wasteful number, since it uses less digits than its factorization.

256615328280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138461083 (or 2138461079 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 256615328280 in words is "two hundred fifty-six billion, six hundred fifteen million, three hundred twenty-eight thousand, two hundred eighty".