642994570 has 32 divisors (see below), whose sum is σ = 1238137488. Its totient is φ = 239566848.

The previous prime is 642994559. The next prime is 642994577. The reversal of 642994570 is 75499246.

It can be written as a sum of positive squares in 8 ways, for example, as 276922881 + 366071689 = 16641^2 + 19133^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642994570.

It is not an unprimeable number, because it can be changed into a prime (642994577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3007 + ... + 35986.

Almost surely, 2^642994570 is an apocalyptic number.

642994570 is a deficient number, since it is larger than the sum of its proper divisors (595142918).

642994570 is a wasteful number, since it uses less digits than its factorization.

642994570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39114.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 642994570 is about 25357.3375968377. The cubic root of 642994570 is about 863.1158695914.

The spelling of 642994570 in words is "six hundred forty-two million, nine hundred ninety-four thousand, five hundred seventy".