656242620 has 48 divisors (see below), whose sum is σ = 2004524928. Its totient is φ = 159088960.

The previous prime is 656242607. The next prime is 656242621. The reversal of 656242620 is 26242656.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656242621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496494 + ... + 497813.

It is an arithmetic number, because the mean of its divisors is an integer number (41760936).

Almost surely, 2^656242620 is an apocalyptic number.

656242620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656242620 is an abundant number, since it is smaller than the sum of its proper divisors (1348282308).

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

656242620 is a wasteful number, since it uses less digits than its factorization.

656242620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994330 (or 994328 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 656242620 is about 25617.2328716433. The cubic root of 656242620 is about 869.0034036759.

The spelling of 656242620 in words is "six hundred fifty-six million, two hundred forty-two thousand, six hundred twenty".