639220374 has 48 divisors (see below), whose sum is σ = 1495384800. Its totient is φ = 196172928.

The previous prime is 639220367. The next prime is 639220391. The reversal of 639220374 is 473022936.

It is a happy number.

639220374 is a `hidden beast` number, since 63 + 9 + 220 + 374 = 666.

639220374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92367 + ... + 99045.

It is an arithmetic number, because the mean of its divisors is an integer number (31153850).

Almost surely, 2^639220374 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639220374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747692400).

639220374 is an abundant number, since it is smaller than the sum of its proper divisors (856164426).

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

639220374 is a wasteful number, since it uses less digits than its factorization.

639220374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7109 (or 7106 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 639220374 is about 25282.8078741266. The cubic root of 639220374 is about 861.4238060558.

The spelling of 639220374 in words is "six hundred thirty-nine million, two hundred twenty thousand, three hundred seventy-four".