765640622440 has 32 divisors (see below), whose sum is σ = 1755195016680. Its totient is φ = 300477828352.

The previous prime is 765640622437. The next prime is 765640622503. The reversal of 765640622440 is 44226046567.

It can be written as a sum of positive squares in 4 ways, for example, as 742537230436 + 23103392004 = 861706^2 + 151998^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180573499 + ... + 180577738.

Almost surely, 2^765640622440 is an apocalyptic number.

It is an amenable number.

765640622440 is an abundant number, since it is smaller than the sum of its proper divisors (989554394240).

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

765640622440 is a wasteful number, since it uses less digits than its factorization.

765640622440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361151301 (or 361151297 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 46.

The spelling of 765640622440 in words is "seven hundred sixty-five billion, six hundred forty million, six hundred twenty-two thousand, four hundred forty".