642247624 has 16 divisors (see below), whose sum is σ = 1275050700. Its totient is φ = 302234112.

The previous prime is 642247603. The next prime is 642247631. The reversal of 642247624 is 426742246.

It can be written as a sum of positive squares in 2 ways, for example, as 635947524 + 6300100 = 25218^2 + 2510^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361069 + ... + 2361340.

Almost surely, 2^642247624 is an apocalyptic number.

It is an amenable number.

642247624 is a deficient number, since it is larger than the sum of its proper divisors (632803076).

642247624 is a wasteful number, since it uses less digits than its factorization.

642247624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4722432 (or 4722428 counting only the distinct ones).

The product of its digits is 129024, while the sum is 37.

The square root of 642247624 is about 25342.6049174113. The cubic root of 642247624 is about 862.7815221591.

The spelling of 642247624 in words is "six hundred forty-two million, two hundred forty-seven thousand, six hundred twenty-four".