3640063920 has 80 divisors (see below), whose sum is σ = 11290110720. Its totient is φ = 970175232.

The previous prime is 3640063901. The next prime is 3640063991. The reversal of 3640063920 is 293600463.

It is a tau number, because it is divible by the number of its divisors (80).

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, 762501 + ... + 767259.

It is an arithmetic number, because the mean of its divisors is an integer number (141126384).

Almost surely, 2^3640063920 is an apocalyptic number.

3640063920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3640063920 is an abundant number, since it is smaller than the sum of its proper divisors (7650046800).

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

3640063920 is a wasteful number, since it uses less digits than its factorization.

3640063920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7962 (or 7956 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 3640063920 is about 60332.9422455096. The cubic root of 3640063920 is about 1538.2833404014.

The spelling of 3640063920 in words is "three billion, six hundred forty million, sixty-three thousand, nine hundred twenty".