256116560 has 80 divisors (see below), whose sum is σ = 720596736. Its totient is φ = 82642944.

The previous prime is 256116559. The next prime is 256116593. The reversal of 256116560 is 65611652.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3932 + ... + 22971.

Almost surely, 2^256116560 is an apocalyptic number.

256116560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256116560 is an abundant number, since it is smaller than the sum of its proper divisors (464480176).

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

256116560 is a wasteful number, since it uses less digits than its factorization.

256116560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26940 (or 26934 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 256116560 is about 16003.6420854754. The cubic root of 256116560 is about 635.0567746373.

The spelling of 256116560 in words is "two hundred fifty-six million, one hundred sixteen thousand, five hundred sixty".