639083520 has 440 divisors, whose sum is σ = 2425351104. Its totient is φ = 160579584.

The previous prime is 639083513. The next prime is 639083551. The reversal of 639083520 is 25380936.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9538527 + ... + 9538593.

Almost surely, 2^639083520 is an apocalyptic number.

639083520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639083520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1212675552).

639083520 is an abundant number, since it is smaller than the sum of its proper divisors (1786267584).

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

639083520 is a wasteful number, since it uses less digits than its factorization.

639083520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 639083520 is about 25280.1012656200. The cubic root of 639083520 is about 861.3623261069.

The spelling of 639083520 in words is "six hundred thirty-nine million, eighty-three thousand, five hundred twenty".