642655232 has 22 divisors (see below), whose sum is σ = 1284684918. Its totient is φ = 321327104.

The previous prime is 642655219. The next prime is 642655243. The reversal of 642655232 is 232556246.

It can be written as a sum of positive squares in only one way, i.e., 352838656 + 289816576 = 18784^2 + 17024^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642655192 and 642655201.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312773 + ... + 314820.

It is an arithmetic number, because the mean of its divisors is an integer number (58394769).

Almost surely, 2^642655232 is an apocalyptic number.

It is an amenable number.

642655232 is a deficient number, since it is larger than the sum of its proper divisors (642029686).

642655232 is an equidigital number, since it uses as much as digits as its factorization.

642655232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627613 (or 627595 counting only the distinct ones).

The product of its digits is 86400, while the sum is 35.

The square root of 642655232 is about 25350.6455933572. The cubic root of 642655232 is about 862.9640074735.

The spelling of 642655232 in words is "six hundred forty-two million, six hundred fifty-five thousand, two hundred thirty-two".