639078960 has 160 divisors (see below), whose sum is σ = 2259230400. Its totient is φ = 148045824.

The previous prime is 639078949. The next prime is 639078991. The reversal of 639078960 is 69870936.

It is a happy number.

It is a super-2 number, since 2×639078960² = 816843834229363200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47016 + ... + 59064.

It is an arithmetic number, because the mean of its divisors is an integer number (14120190).

Almost surely, 2^639078960 is an apocalyptic number.

639078960 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 639078960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129615200).

639078960 is an abundant number, since it is smaller than the sum of its proper divisors (1620151440).

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

639078960 is a wasteful number, since it uses less digits than its factorization.

639078960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12095 (or 12089 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 639078960 is about 25280.0110759469. The cubic root of 639078960 is about 861.3602774328.

The spelling of 639078960 in words is "six hundred thirty-nine million, seventy-eight thousand, nine hundred sixty".