639786750207372 has 168 divisors, whose sum is σ = 1700322089208624. Its totient is φ = 210516122797056.

The previous prime is 639786750207317. The next prime is 639786750207391. The reversal of 639786750207372 is 273702057687936.

It is a happy number.

639786750207372 is a `hidden beast` number, since 6 + 3 + 9 + 7 + 86 + 7 + 502 + 0 + 7 + 37 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 639786750207372.

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, 287631508 + ... + 289847300.

It is an arithmetic number, because the mean of its divisors is an integer number (10120964816718).

Almost surely, 2^{639786750207372} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639786750207372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850161044604312).

639786750207372 is an abundant number, since it is smaller than the sum of its proper divisors (1060535339001252).

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

639786750207372 is a wasteful number, since it uses less digits than its factorization.

639786750207372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217091 (or 2217074 counting only the distinct ones).

The product of its (nonzero) digits is 1120210560, while the sum is 72.

The spelling of 639786750207372 in words is "six hundred thirty-nine trillion, seven hundred eighty-six billion, seven hundred fifty million, two hundred seven thousand, three hundred seventy-two".