761640642 has 24 divisors (see below), whose sum is σ = 1885967616. Its totient is φ = 217611576.

The previous prime is 761640637. The next prime is 761640683. The reversal of 761640642 is 246046167.

761640642 is a `hidden beast` number, since 7 + 6 + 1 + 6 + 4 + 0 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 761640597 and 761640606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3022258 + ... + 3022509.

It is an arithmetic number, because the mean of its divisors is an integer number (78581984).

Almost surely, 2^761640642 is an apocalyptic number.

761640642 is an abundant number, since it is smaller than the sum of its proper divisors (1124326974).

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

761640642 is a wasteful number, since it uses less digits than its factorization.

761640642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6044782 (or 6044779 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 761640642 is about 27597.8376326842. The cubic root of 761640642 is about 913.2367296491.

The spelling of 761640642 in words is "seven hundred sixty-one million, six hundred forty thousand, six hundred forty-two".