634779664 has 40 divisors (see below), whose sum is σ = 1315878080. Its totient is φ = 295747200.

The previous prime is 634779623. The next prime is 634779679. The reversal of 634779664 is 466977436.

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, 1429 + ... + 35659.

It is an arithmetic number, because the mean of its divisors is an integer number (32896952).

Almost surely, 2^634779664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634779664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657939040).

634779664 is an abundant number, since it is smaller than the sum of its proper divisors (681098416).

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

634779664 is a wasteful number, since it uses less digits than its factorization.

634779664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34319 (or 34313 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 52.

The square root of 634779664 is about 25194.8340736747. The cubic root of 634779664 is about 859.4243777407.

The spelling of 634779664 in words is "six hundred thirty-four million, seven hundred seventy-nine thousand, six hundred sixty-four".