640272481268 has 36 divisors (see below), whose sum is σ = 1303795765440. Its totient is φ = 274321665072.

The previous prime is 640272481243. The next prime is 640272481273. The reversal of 640272481268 is 862184272046.

It is a congruent number.

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, 188363 + ... + 1147181.

It is an arithmetic number, because the mean of its divisors is an integer number (36216549040).

Almost surely, 2^640272481268 is an apocalyptic number.

It is an amenable number.

640272481268 is an abundant number, since it is smaller than the sum of its proper divisors (663523284172).

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

640272481268 is a wasteful number, since it uses less digits than its factorization.

640272481268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962244 (or 962235 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 50.

The spelling of 640272481268 in words is "six hundred forty billion, two hundred seventy-two million, four hundred eighty-one thousand, two hundred sixty-eight".