640440220024 has 16 divisors (see below), whose sum is σ = 1309991359320. Its totient is φ = 291109190880.

The previous prime is 640440220009. The next prime is 640440220033. The reversal of 640440220024 is 420022044046.

640440220024 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 640440219974 and 640440220001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3638864799 + ... + 3638864974.

Almost surely, 2^640440220024 is an apocalyptic number.

It is an amenable number.

640440220024 is an abundant number, since it is smaller than the sum of its proper divisors (669551139296).

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

640440220024 is a wasteful number, since it uses less digits than its factorization.

640440220024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7277729790 (or 7277729786 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

The spelling of 640440220024 in words is "six hundred forty billion, four hundred forty million, two hundred twenty thousand, twenty-four".