639871202880 has 560 divisors, whose sum is σ = 2801406558720. Its totient is φ = 135005294592.

The previous prime is 639871202879. The next prime is 639871202903. The reversal of 639871202880 is 88202178936.

It is a happy number.

639871202880 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (560).

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 79 ways as a sum of consecutive naturals, for example, 2223081 + ... + 2494359.

It is an arithmetic number, because the mean of its divisors is an integer number (5002511712).

Almost surely, 2^639871202880 is an apocalyptic number.

639871202880 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 639871202880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1400703279360).

639871202880 is an abundant number, since it is smaller than the sum of its proper divisors (2161535355840).

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

639871202880 is a wasteful number, since it uses less digits than its factorization.

639871202880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271328 (or 271309 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 639871202880 in words is "six hundred thirty-nine billion, eight hundred seventy-one million, two hundred two thousand, eight hundred eighty".