640202787744 has 72 divisors (see below), whose sum is σ = 1819748058912. Its totient is φ = 196985468160.

The previous prime is 640202787703. The next prime is 640202787769. The reversal of 640202787744 is 447787202046.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19713892 + ... + 19746339.

It is an arithmetic number, because the mean of its divisors is an integer number (25274278596).

Almost surely, 2^640202787744 is an apocalyptic number.

It is an amenable number.

640202787744 is an abundant number, since it is smaller than the sum of its proper divisors (1179545271168).

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

640202787744 is a wasteful number, since it uses less digits than its factorization.

640202787744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39460270 (or 39460249 counting only the distinct ones).

The product of its (nonzero) digits is 4214784, while the sum is 51.

The spelling of 640202787744 in words is "six hundred forty billion, two hundred two million, seven hundred eighty-seven thousand, seven hundred forty-four".