642763642764 has 12 divisors (see below), whose sum is σ = 1499781833144. Its totient is φ = 214254547584.

The previous prime is 642763642723. The next prime is 642763642793. The reversal of 642763642764 is 467246367246.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26781818437 + ... + 26781818460.

Almost surely, 2^642763642764 is an apocalyptic number.

It is an amenable number.

642763642764 is an abundant number, since it is smaller than the sum of its proper divisors (857018190380).

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

642763642764 is a wasteful number, since it uses less digits than its factorization.

642763642764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53563636904 (or 53563636902 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 57.

The spelling of 642763642764 in words is "six hundred forty-two billion, seven hundred sixty-three million, six hundred forty-two thousand, seven hundred sixty-four".