639892248 has 64 divisors (see below), whose sum is σ = 1647565920. Its totient is φ = 206976000.

The previous prime is 639892237. The next prime is 639892249. The reversal of 639892248 is 842298936.

639892248 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 639892248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639892249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192198 + ... + 195498.

Almost surely, 2^639892248 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 639892248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823782960).

639892248 is an abundant number, since it is smaller than the sum of its proper divisors (1007673672).

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

639892248 is a wasteful number, since it uses less digits than its factorization.

639892248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548 (or 3544 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 51.

The square root of 639892248 is about 25296.0915558115. The cubic root of 639892248 is about 861.7255098302.

The spelling of 639892248 in words is "six hundred thirty-nine million, eight hundred ninety-two thousand, two hundred forty-eight".