77864427506 has 16 divisors (see below), whose sum is σ = 121022719488. Its totient is φ = 37533072000.

The previous prime is 77864427469. The next prime is 77864427521. The reversal of 77864427506 is 60572446877.

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, 2371295 + ... + 2403906.

It is an arithmetic number, because the mean of its divisors is an integer number (7563919968).

Almost surely, 2^77864427506 is an apocalyptic number.

77864427506 is a deficient number, since it is larger than the sum of its proper divisors (43158291982).

77864427506 is a wasteful number, since it uses less digits than its factorization.

77864427506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775497.

The product of its (nonzero) digits is 15805440, while the sum is 56.

The spelling of 77864427506 in words is "seventy-seven billion, eight hundred sixty-four million, four hundred twenty-seven thousand, five hundred six".