638820330830 has 64 divisors (see below), whose sum is σ = 1301092761600. Its totient is φ = 223695803520.

The previous prime is 638820330773. The next prime is 638820330961. The reversal of 638820330830 is 38033028836.

638820330830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 944819 + ... + 1473201.

It is an arithmetic number, because the mean of its divisors is an integer number (20329574400).

Almost surely, 2^638820330830 is an apocalyptic number.

638820330830 is an abundant number, since it is smaller than the sum of its proper divisors (662272430770).

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

638820330830 is a wasteful number, since it uses less digits than its factorization.

638820330830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528809.

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 638820330830 in words is "six hundred thirty-eight billion, eight hundred twenty million, three hundred thirty thousand, eight hundred thirty".