642868022736 has 50 divisors (see below), whose sum is σ = 1860646572642. Its totient is φ = 214289340480.

The previous prime is 642868022717. The next prime is 642868022773. The reversal of 642868022736 is 637220868246.

642868022736 is a `hidden beast` number, since 64 + 286 + 80 + 227 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 641370332736 + 1497690000 = 800856^2 + 38700^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 248018775 + ... + 248021366.

Almost surely, 2^642868022736 is an apocalyptic number.

It is an amenable number.

642868022736 is an abundant number, since it is smaller than the sum of its proper divisors (1217778549906).

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

642868022736 is a wasteful number, since it uses less digits than its factorization.

642868022736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496040161 (or 496040146 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 54.

The spelling of 642868022736 in words is "six hundred forty-two billion, eight hundred sixty-eight million, twenty-two thousand, seven hundred thirty-six".