639233672 has 64 divisors (see below), whose sum is σ = 1506263040. Its totient is φ = 247060800.

The previous prime is 639233669. The next prime is 639233681. The reversal of 639233672 is 276332936.

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, 74147 + ... + 82317.

It is an arithmetic number, because the mean of its divisors is an integer number (23535360).

Almost surely, 2^639233672 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 639233672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753131520).

639233672 is an abundant number, since it is smaller than the sum of its proper divisors (867029368).

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

639233672 is a wasteful number, since it uses less digits than its factorization.

639233672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322 (or 8318 counting only the distinct ones).

The product of its digits is 244944, while the sum is 41.

The square root of 639233672 is about 25283.0708577894. The cubic root of 639233672 is about 861.4297795483.

The spelling of 639233672 in words is "six hundred thirty-nine million, two hundred thirty-three thousand, six hundred seventy-two".