656242680 has 32 divisors (see below), whose sum is σ = 1968728400. Its totient is φ = 174998016.

The previous prime is 656242649. The next prime is 656242681. The reversal of 656242680 is 86242656.

It is a super-3 number, since 3×656242680³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656242681) 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 7 ways as a sum of consecutive naturals, for example, 2734225 + ... + 2734464.

Almost surely, 2^656242680 is an apocalyptic number.

656242680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656242680 is an abundant number, since it is smaller than the sum of its proper divisors (1312485720).

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

656242680 is a wasteful number, since it uses less digits than its factorization.

656242680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468703 (or 5468699 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 656242680 is about 25617.2340427299. The cubic root of 656242680 is about 869.0034301601.

The spelling of 656242680 in words is "six hundred fifty-six million, two hundred forty-two thousand, six hundred eighty".