642616884 has 72 divisors (see below), whose sum is σ = 1999262720. Its totient is φ = 169480512.

The previous prime is 642616867. The next prime is 642616907. The reversal of 642616884 is 488616246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94804 + ... + 101355.

Almost surely, 2^642616884 is an apocalyptic number.

It is an amenable number.

642616884 is an abundant number, since it is smaller than the sum of its proper divisors (1356645836).

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

642616884 is a wasteful number, since it uses less digits than its factorization.

642616884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196189 (or 196184 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 642616884 is about 25349.8892305272. The cubic root of 642616884 is about 862.9468424368.

The spelling of 642616884 in words is "six hundred forty-two million, six hundred sixteen thousand, eight hundred eighty-four".