2640865608 has 24 divisors (see below), whose sum is σ = 7152344550. Its totient is φ = 880288512.

The previous prime is 2640865489. The next prime is 2640865631. The reversal of 2640865608 is 8065680462.

2640865608 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 86 + 560 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1901134404 + 739731204 = 43602^2 + 27198^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18339273 + ... + 18339416.

Almost surely, 2^2640865608 is an apocalyptic number.

It is an amenable number.

2640865608 is an abundant number, since it is smaller than the sum of its proper divisors (4511478942).

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

2640865608 is a wasteful number, since it uses less digits than its factorization.

2640865608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36678701 (or 36678694 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 2640865608 is about 51389.3530607265. The cubic root of 2640865608 is about 1382.2356829716.

The spelling of 2640865608 in words is "two billion, six hundred forty million, eight hundred sixty-five thousand, six hundred eight".