642748643736 has 32 divisors (see below), whose sum is σ = 1606911436800. Its totient is φ = 214244237600.

The previous prime is 642748643717. The next prime is 642748643809. The reversal of 642748643736 is 637346847246.

It is a self number, because there is not a number n which added to its sum of digits gives 642748643736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725305 + ... + 1345943.

It is an arithmetic number, because the mean of its divisors is an integer number (50215982400).

Almost surely, 2^642748643736 is an apocalyptic number.

It is an amenable number.

642748643736 is an abundant number, since it is smaller than the sum of its proper divisors (964162793064).

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

642748643736 is a wasteful number, since it uses less digits than its factorization.

642748643736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663799 (or 663795 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 60.

The spelling of 642748643736 in words is "six hundred forty-two billion, seven hundred forty-eight million, six hundred forty-three thousand, seven hundred thirty-six".