642728592 has 60 divisors (see below), whose sum is σ = 1962274704. Its totient is φ = 194765760.

The previous prime is 642728557. The next prime is 642728617. The reversal of 642728592 is 295827246.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201298 + ... + 204465.

Almost surely, 2^642728592 is an apocalyptic number.

It is an amenable number.

642728592 is an abundant number, since it is smaller than the sum of its proper divisors (1319546112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642728592 is a wasteful number, since it uses less digits than its factorization.

642728592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405788 (or 405779 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 642728592 is about 25352.0924580201. The cubic root of 642728592 is about 862.9968424098.

The spelling of 642728592 in words is "six hundred forty-two million, seven hundred twenty-eight thousand, five hundred ninety-two".