639124992 has 240 divisors, whose sum is σ = 2091241152. Its totient is φ = 193259520.

The previous prime is 639124973. The next prime is 639125033. The reversal of 639124992 is 299421936.

It is a happy number.

639124992 is a `hidden beast` number, since 639 + 1 + 2 + 4 + 9 + 9 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 1368343 + ... + 1368809.

Almost surely, 2^639124992 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 639124992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045620576).

639124992 is an abundant number, since it is smaller than the sum of its proper divisors (1452116160).

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

639124992 is an equidigital number, since it uses as much as digits as its factorization.

639124992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 483 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 639124992 is about 25280.9215021921. The cubic root of 639124992 is about 861.3809578113.

The spelling of 639124992 in words is "six hundred thirty-nine million, one hundred twenty-four thousand, nine hundred ninety-two".