632640208 has 80 divisors (see below), whose sum is σ = 1329914880. Its totient is φ = 290746368.

The previous prime is 632640161. The next prime is 632640221. The reversal of 632640208 is 802046236.

It is a self number, because there is not a number n which added to its sum of digits gives 632640208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1320513 + ... + 1320991.

It is an arithmetic number, because the mean of its divisors is an integer number (16623936).

Almost surely, 2^632640208 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 632640208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (664957440).

632640208 is an abundant number, since it is smaller than the sum of its proper divisors (697274672).

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

632640208 is a wasteful number, since it uses less digits than its factorization.

632640208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 632640208 is about 25152.3400104245. The cubic root of 632640208 is about 858.4577587513.

The spelling of 632640208 in words is "six hundred thirty-two million, six hundred forty thousand, two hundred eight".