642635016 has 32 divisors (see below), whose sum is σ = 1610658240. Its totient is φ = 213668928.

The previous prime is 642634963. The next prime is 642635033. The reversal of 642635016 is 610536246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24196 + ... + 43251.

It is an arithmetic number, because the mean of its divisors is an integer number (50333070).

Almost surely, 2^642635016 is an apocalyptic number.

It is an amenable number.

642635016 is an abundant number, since it is smaller than the sum of its proper divisors (968023224).

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

642635016 is a wasteful number, since it uses less digits than its factorization.

642635016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67853 (or 67849 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 642635016 is about 25350.2468627033. The cubic root of 642635016 is about 862.9549586282.

The spelling of 642635016 in words is "six hundred forty-two million, six hundred thirty-five thousand, sixteen".