640440036012 has 48 divisors (see below), whose sum is σ = 1708231617792. Its totient is φ = 182940918720.

The previous prime is 640440036001. The next prime is 640440036053. The reversal of 640440036012 is 210630044046.

640440036012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504414 + ... + 1239077.

It is an arithmetic number, because the mean of its divisors is an integer number (35588158704).

Almost surely, 2^640440036012 is an apocalyptic number.

It is an amenable number.

640440036012 is an abundant number, since it is smaller than the sum of its proper divisors (1067791581780).

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

640440036012 is a wasteful number, since it uses less digits than its factorization.

640440036012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747878 (or 1747876 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 640440036012 in words is "six hundred forty billion, four hundred forty million, thirty-six thousand, twelve".