79889728 has 56 divisors (see below), whose sum is σ = 166363904. Its totient is φ = 38016000.

The previous prime is 79889701. The next prime is 79889767. The reversal of 79889728 is 82798897.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132628 + ... + 133228.

It is an arithmetic number, because the mean of its divisors is an integer number (2970784).

Almost surely, 2^79889728 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 79889728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83181952).

79889728 is an abundant number, since it is smaller than the sum of its proper divisors (86474176).

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

79889728 is a wasteful number, since it uses less digits than its factorization.

79889728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 701 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 58.

The square root of 79889728 is about 8938.1053920839. The cubic root of 79889728 is about 430.6888687872.

The spelling of 79889728 in words is "seventy-nine million, eight hundred eighty-nine thousand, seven hundred twenty-eight".