639628319160 has 192 divisors, whose sum is σ = 2170177850880. Its totient is φ = 163076094720.

The previous prime is 639628319147. The next prime is 639628319171. The reversal of 639628319160 is 61913826936.

639628319160 is a `hidden beast` number, since 6 + 3 + 9 + 628 + 3 + 1 + 9 + 1 + 6 + 0 = 666.

639628319160 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 = 639628319097 and 639628319106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19118367 + ... + 19151793.

It is an arithmetic number, because the mean of its divisors is an integer number (11303009640).

Almost surely, 2^639628319160 is an apocalyptic number.

639628319160 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 639628319160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1085088925440).

639628319160 is an abundant number, since it is smaller than the sum of its proper divisors (1530549531720).

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

639628319160 is a wasteful number, since it uses less digits than its factorization.

639628319160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35778 (or 35771 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 639628319160 in words is "six hundred thirty-nine billion, six hundred twenty-eight million, three hundred nineteen thousand, one hundred sixty".