656730432 has 42 divisors (see below), whose sum is σ = 1882400858. Its totient is φ = 218909952.

The previous prime is 656730359. The next prime is 656730457. The reversal of 656730432 is 234037656.

It can be written as a sum of positive squares in only one way, i.e., 639887616 + 16842816 = 25296^2 + 4104^2 .

It is a super-3 number, since 3×656730432³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 569503 + ... + 570654.

Almost surely, 2^656730432 is an apocalyptic number.

It is an amenable number.

656730432 is an abundant number, since it is smaller than the sum of its proper divisors (1225670426).

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

656730432 is a wasteful number, since it uses less digits than its factorization.

656730432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140175 (or 1140162 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 36.

The square root of 656730432 is about 25626.7522717960. The cubic root of 656730432 is about 869.2186722783.

The spelling of 656730432 in words is "six hundred fifty-six million, seven hundred thirty thousand, four hundred thirty-two".