642575056 has 30 divisors (see below), whose sum is σ = 1258484370. Its totient is φ = 317815488.

The previous prime is 642575053. The next prime is 642575057. The reversal of 642575056 is 650575246.

It can be written as a sum of positive squares in only one way, i.e., 589518400 + 53056656 = 24280^2 + 7284^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642575051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1058305 + ... + 1058911.

It is an arithmetic number, because the mean of its divisors is an integer number (41949479).

Almost surely, 2^642575056 is an apocalyptic number.

It is an amenable number.

642575056 is a deficient number, since it is larger than the sum of its proper divisors (615909314).

642575056 is an equidigital number, since it uses as much as digits as its factorization.

642575056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

The square root of 642575056 is about 25349.0642036348. The cubic root of 642575056 is about 862.9281189305.

The spelling of 642575056 in words is "six hundred forty-two million, five hundred seventy-five thousand, fifty-six".