79321728168 has 128 divisors (see below), whose sum is σ = 228110860800. Its totient is φ = 25523278848.

The previous prime is 79321728131. The next prime is 79321728173. The reversal of 79321728168 is 86182712397.

It is a happy number.

79321728168 is a `hidden beast` number, since 7 + 93 + 217 + 281 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 687580 + ... + 794612.

It is an arithmetic number, because the mean of its divisors is an integer number (1782116100).

Almost surely, 2^79321728168 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 79321728168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114055430400).

79321728168 is an abundant number, since it is smaller than the sum of its proper divisors (148789132632).

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

79321728168 is a wasteful number, since it uses less digits than its factorization.

79321728168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107168 (or 107158 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 79321728168 in words is "seventy-nine billion, three hundred twenty-one million, seven hundred twenty-eight thousand, one hundred sixty-eight".