639120961752 has 128 divisors (see below), whose sum is σ = 1968060326400. Its totient is φ = 168427865088.

The previous prime is 639120961729. The next prime is 639120961753. The reversal of 639120961752 is 257169021936.

639120961752 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 639120961695 and 639120961704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639120961753) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2701663 + ... + 2928689.

It is an arithmetic number, because the mean of its divisors is an integer number (15375471300).

Almost surely, 2^639120961752 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 639120961752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984030163200).

639120961752 is an abundant number, since it is smaller than the sum of its proper divisors (1328939364648).

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

639120961752 is a wasteful number, since it uses less digits than its factorization.

639120961752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228345 (or 228341 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 639120961752 in words is "six hundred thirty-nine billion, one hundred twenty million, nine hundred sixty-one thousand, seven hundred fifty-two".