639530496 has 360 divisors, whose sum is σ = 2150820672. Its totient is φ = 182476800.

The previous prime is 639530491. The next prime is 639530501. The reversal of 639530496 is 694035936.

It is a happy number.

639530496 is a `hidden beast` number, since 639 + 5 + 3 + 0 + 4 + 9 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (639530491) and next prime (639530501).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639530491) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17284590 + ... + 17284626.

Almost surely, 2^639530496 is an apocalyptic number.

639530496 is a gapful number since it is divisible by the number (66) 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 639530496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075410336).

639530496 is an abundant number, since it is smaller than the sum of its proper divisors (1511290176).

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

639530496 is a wasteful number, since it uses less digits than its factorization.

639530496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 45.

The square root of 639530496 is about 25288.9401913168. The cubic root of 639530496 is about 861.5630920222.

It can be divided in two parts, 639 and 530496, that added together give a palindrome (531135).

The spelling of 639530496 in words is "six hundred thirty-nine million, five hundred thirty thousand, four hundred ninety-six".