642513830 has 16 divisors (see below), whose sum is σ = 1321742880. Its totient is φ = 220290432.

The previous prime is 642513811. The next prime is 642513841. The reversal of 642513830 is 38315246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4589315 + ... + 4589454.

It is an arithmetic number, because the mean of its divisors is an integer number (82608930).

Almost surely, 2^642513830 is an apocalyptic number.

642513830 is an abundant number, since it is smaller than the sum of its proper divisors (679229050).

642513830 is a wasteful number, since it uses less digits than its factorization.

642513830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9178783.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 642513830 is about 25347.8565168734. The cubic root of 642513830 is about 862.9007108145.

The spelling of 642513830 in words is "six hundred forty-two million, five hundred thirteen thousand, eight hundred thirty".