79309594638 has 80 divisors (see below), whose sum is σ = 181188342720. Its totient is φ = 25920108864.

The previous prime is 79309594633. The next prime is 79309594657. The reversal of 79309594638 is 83649590397.

79309594638 is a `hidden beast` number, since 7 + 9 + 3 + 0 + 9 + 594 + 6 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79309594633) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20235243 + ... + 20239161.

It is an arithmetic number, because the mean of its divisors is an integer number (2264854284).

Almost surely, 2^79309594638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79309594638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90594171360).

79309594638 is an abundant number, since it is smaller than the sum of its proper divisors (101878748082).

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

79309594638 is a wasteful number, since it uses less digits than its factorization.

79309594638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6343 (or 6334 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 63.

The spelling of 79309594638 in words is "seventy-nine billion, three hundred nine million, five hundred ninety-four thousand, six hundred thirty-eight".