642439612 has 6 divisors (see below), whose sum is σ = 1124269328. Its totient is φ = 321219804.

The previous prime is 642439601. The next prime is 642439627. The reversal of 642439612 is 216934246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80304948 + ... + 80304955.

Almost surely, 2^642439612 is an apocalyptic number.

It is an amenable number.

642439612 is a deficient number, since it is larger than the sum of its proper divisors (481829716).

642439612 is a wasteful number, since it uses less digits than its factorization.

642439612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160609907 (or 160609905 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The square root of 642439612 is about 25346.3924849277. The cubic root of 642439612 is about 862.8674844319.

The spelling of 642439612 in words is "six hundred forty-two million, four hundred thirty-nine thousand, six hundred twelve".