636973772 has 6 divisors (see below), whose sum is σ = 1114704108. Its totient is φ = 318486884.

The previous prime is 636973747. The next prime is 636973783. The reversal of 636973772 is 277379636.

It is a self number, because there is not a number n which added to its sum of digits gives 636973772.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79621718 + ... + 79621725.

It is an arithmetic number, because the mean of its divisors is an integer number (185784018).

Almost surely, 2^636973772 is an apocalyptic number.

It is an amenable number.

636973772 is a deficient number, since it is larger than the sum of its proper divisors (477730336).

636973772 is a wasteful number, since it uses less digits than its factorization.

636973772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159243447 (or 159243445 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 50.

The square root of 636973772 is about 25238.3393273012. The cubic root of 636973772 is about 860.4134356105.

The spelling of 636973772 in words is "six hundred thirty-six million, nine hundred seventy-three thousand, seven hundred seventy-two".