636479648 has 24 divisors (see below), whose sum is σ = 1432079712. Its totient is φ = 272776896.

The previous prime is 636479639. The next prime is 636479707. The reversal of 636479648 is 846974636.

It is a self number, because there is not a number n which added to its sum of digits gives 636479648.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420490 + ... + 1420937.

It is an arithmetic number, because the mean of its divisors is an integer number (59669988).

Almost surely, 2^636479648 is an apocalyptic number.

It is an amenable number.

636479648 is an abundant number, since it is smaller than the sum of its proper divisors (795600064).

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

636479648 is a wasteful number, since it uses less digits than its factorization.

636479648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841444 (or 2841436 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 53.

The square root of 636479648 is about 25228.5482737315. The cubic root of 636479648 is about 860.1908932654.

The spelling of 636479648 in words is "six hundred thirty-six million, four hundred seventy-nine thousand, six hundred forty-eight".