639376331760 has 280 divisors, whose sum is σ = 2300708828544. Its totient is φ = 164999877120.

The previous prime is 639376331743. The next prime is 639376331773. The reversal of 639376331760 is 67133673936.

It is a super-2 number, since 2×639376331760² (a number of 24 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 639376331697 and 639376331706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1631094 + ... + 1984746.

Almost surely, 2^639376331760 is an apocalyptic number.

639376331760 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 639376331760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1150354414272).

639376331760 is an abundant number, since it is smaller than the sum of its proper divisors (1661332496784).

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

639376331760 is a wasteful number, since it uses less digits than its factorization.

639376331760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353715 (or 353694 counting only the distinct ones).

The product of its (nonzero) digits is 7715736, while the sum is 54.

The spelling of 639376331760 in words is "six hundred thirty-nine billion, three hundred seventy-six million, three hundred thirty-one thousand, seven hundred sixty".