79123679838 has 96 divisors (see below), whose sum is σ = 206554233600. Its totient is φ = 21384010368.

The previous prime is 79123679797. The next prime is 79123679863. The reversal of 79123679838 is 83897632197.

It is a super-2 number, since 2×79123679838² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1552570 + ... + 1602722.

It is an arithmetic number, because the mean of its divisors is an integer number (2151606600).

Almost surely, 2^79123679838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79123679838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103277116800).

79123679838 is an abundant number, since it is smaller than the sum of its proper divisors (127430553762).

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

79123679838 is a wasteful number, since it uses less digits than its factorization.

79123679838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50846 (or 50843 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The spelling of 79123679838 in words is "seventy-nine billion, one hundred twenty-three million, six hundred seventy-nine thousand, eight hundred thirty-eight".