656979912 has 144 divisors (see below), whose sum is σ = 1904797440. Its totient is φ = 204456384.

The previous prime is 656979899. The next prime is 656979919. The reversal of 656979912 is 219979656.

656979912 is a `hidden beast` number, since 6 + 569 + 79 + 9 + 1 + 2 = 666.

656979912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (656979919) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1789953 + ... + 1790319.

It is an arithmetic number, because the mean of its divisors is an integer number (13227760).

Almost surely, 2^656979912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656979912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952398720).

656979912 is an abundant number, since it is smaller than the sum of its proper divisors (1247817528).

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

656979912 is a wasteful number, since it uses less digits than its factorization.

656979912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 442 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The square root of 656979912 is about 25631.6193791965. The cubic root of 656979912 is about 869.3287251555.

The spelling of 656979912 in words is "six hundred fifty-six million, nine hundred seventy-nine thousand, nine hundred twelve".