642638588984 has 32 divisors (see below), whose sum is σ = 1421504716800. Its totient is φ = 266532132960.

The previous prime is 642638588983. The next prime is 642638588987. The reversal of 642638588984 is 489885836246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642638588983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185090024 + ... + 185093495.

It is an arithmetic number, because the mean of its divisors is an integer number (44422022400).

Almost surely, 2^642638588984 is an apocalyptic number.

It is an amenable number.

642638588984 is an abundant number, since it is smaller than the sum of its proper divisors (778866127816).

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

642638588984 is a wasteful number, since it uses less digits than its factorization.

642638588984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370183563 (or 370183559 counting only the distinct ones).

The product of its digits is 637009920, while the sum is 71.

The spelling of 642638588984 in words is "six hundred forty-two billion, six hundred thirty-eight million, five hundred eighty-eight thousand, nine hundred eighty-four".