656377380 has 36 divisors (see below), whose sum is σ = 1991011932. Its totient is φ = 175033920.

The previous prime is 656377331. The next prime is 656377391. The reversal of 656377380 is 83773656.

656377380 is a `hidden beast` number, since 6 + 5 + 637 + 7 + 3 + 8 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 272844324 + 383533056 = 16518^2 + 19584^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1823091 + ... + 1823450.

It is an arithmetic number, because the mean of its divisors is an integer number (55305887).

Almost surely, 2^656377380 is an apocalyptic number.

656377380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656377380 is an abundant number, since it is smaller than the sum of its proper divisors (1334634552).

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

656377380 is a wasteful number, since it uses less digits than its factorization.

656377380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646556 (or 3646551 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 656377380 is about 25619.8629972918. The cubic root of 656377380 is about 869.0628831428.

The spelling of 656377380 in words is "six hundred fifty-six million, three hundred seventy-seven thousand, three hundred eighty".