639364078080 has 1600 divisors, whose sum is σ = 2912041617408. Its totient is φ = 130427781120.

The previous prime is 639364078061. The next prime is 639364078151. The reversal of 639364078080 is 80870463936.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 584962014 + ... + 584963106.

Almost surely, 2^639364078080 is an apocalyptic number.

639364078080 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 639364078080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1456020808704).

639364078080 is an abundant number, since it is smaller than the sum of its proper divisors (2272677539328).

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

639364078080 is a wasteful number, since it uses less digits than its factorization.

639364078080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 1154 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 639364078080 in words is "six hundred thirty-nine billion, three hundred sixty-four million, seventy-eight thousand, eighty".