766638872 has 16 divisors (see below), whose sum is σ = 1443728400. Its totient is φ = 381644640.

The previous prime is 766638871. The next prime is 766638883. The reversal of 766638872 is 278836667.

It is a super-2 number, since 2×766638872² = 1175470320122864768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766638871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207404 + ... + 211067.

It is an arithmetic number, because the mean of its divisors is an integer number (90233025).

Almost surely, 2^766638872 is an apocalyptic number.

It is an amenable number.

766638872 is a deficient number, since it is larger than the sum of its proper divisors (677089528).

766638872 is a wasteful number, since it uses less digits than its factorization.

766638872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418706 (or 418702 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 53.

The square root of 766638872 is about 27688.2442924791. The cubic root of 766638872 is about 915.2300662680.

The spelling of 766638872 in words is "seven hundred sixty-six million, six hundred thirty-eight thousand, eight hundred seventy-two".