656312880 has 80 divisors (see below), whose sum is σ = 2154263904. Its totient is φ = 164720640.

The previous prime is 656312879. The next prime is 656312887. The reversal of 656312880 is 88213656.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (656312887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76351 + ... + 84510.

Almost surely, 2^656312880 is an apocalyptic number.

656312880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656312880 is an abundant number, since it is smaller than the sum of its proper divisors (1497951024).

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

656312880 is a wasteful number, since it uses less digits than its factorization.

656312880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160894 (or 160888 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 656312880 is about 25618.6041774332. The cubic root of 656312880 is about 869.0344155803.

The spelling of 656312880 in words is "six hundred fifty-six million, three hundred twelve thousand, eight hundred eighty".