763505640 has 48 divisors (see below), whose sum is σ = 2481394500. Its totient is φ = 203601408.

The previous prime is 763505609. The next prime is 763505641. The reversal of 763505640 is 46505367.

763505640 is a `hidden beast` number, since 7 + 6 + 3 + 5 + 0 + 5 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 748897956 + 14607684 = 27366^2 + 3822^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 763505595 and 763505604.

It is not an unprimeable number, because it can be changed into a prime (763505641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1060065 + ... + 1060784.

Almost surely, 2^763505640 is an apocalyptic number.

It is an amenable number.

763505640 is an abundant number, since it is smaller than the sum of its proper divisors (1717888860).

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

763505640 is a wasteful number, since it uses less digits than its factorization.

763505640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120866 (or 2120859 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 763505640 is about 27631.6058165283. The cubic root of 763505640 is about 913.9815237580.

The spelling of 763505640 in words is "seven hundred sixty-three million, five hundred five thousand, six hundred forty".