642422764 has 12 divisors (see below), whose sum is σ = 1124418064. Its totient is φ = 321160464.

The previous prime is 642422731. The next prime is 642422771. The reversal of 642422764 is 467224246.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 39142 + ... + 53074.

Almost surely, 2^642422764 is an apocalyptic number.

It is an amenable number.

642422764 is a deficient number, since it is larger than the sum of its proper divisors (481995300).

642422764 is a wasteful number, since it uses less digits than its factorization.

642422764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25464 (or 25462 counting only the distinct ones).

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

The square root of 642422764 is about 25346.0601277595. The cubic root of 642422764 is about 862.8599414565.

The spelling of 642422764 in words is "six hundred forty-two million, four hundred twenty-two thousand, seven hundred sixty-four".