79921728 has 112 divisors (see below), whose sum is σ = 238272320. Its totient is φ = 26593920.

The previous prime is 79921727. The next prime is 79921729. The reversal of 79921728 is 82712997.

It is an interprime number because it is at equal distance from previous prime (79921727) and next prime (79921729).

It is not an unprimeable number, because it can be changed into a prime (79921727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139683 + ... + 140253.

Almost surely, 2^79921728 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 79921728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119136160).

79921728 is an abundant number, since it is smaller than the sum of its proper divisors (158350592).

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

79921728 is an frugal number, since it uses more digits than its factorization.

79921728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 576 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 79921728 is about 8939.8953014003. The cubic root of 79921728 is about 430.7463655577.

The spelling of 79921728 in words is "seventy-nine million, nine hundred twenty-one thousand, seven hundred twenty-eight".