642637373790 has 64 divisors (see below), whose sum is σ = 1584482990400. Its totient is φ = 166689008640.

The previous prime is 642637373737. The next prime is 642637373797. The reversal of 642637373790 is 97373736246.

It is a self number, because there is not a number n which added to its sum of digits gives 642637373790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642637373797) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3744460 + ... + 3912320.

It is an arithmetic number, because the mean of its divisors is an integer number (24757546725).

Almost surely, 2^642637373790 is an apocalyptic number.

642637373790 is an abundant number, since it is smaller than the sum of its proper divisors (941845616610).

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

642637373790 is a wasteful number, since it uses less digits than its factorization.

642637373790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171357.

The product of its (nonzero) digits is 24004512, while the sum is 57.

The spelling of 642637373790 in words is "six hundred forty-two billion, six hundred thirty-seven million, three hundred seventy-three thousand, seven hundred ninety".