79774128 has 120 divisors (see below), whose sum is σ = 264045600. Its totient is φ = 21998592.

The previous prime is 79774127. The next prime is 79774139. The reversal of 79774128 is 82147797.

It is a happy number.

It is a super-2 number, since 2×79774128² = 12727822996320768, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (79774127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27868 + ... + 30596.

It is an arithmetic number, because the mean of its divisors is an integer number (2200380).

Almost surely, 2^79774128 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 79774128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132022800).

79774128 is an abundant number, since it is smaller than the sum of its proper divisors (184271472).

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

79774128 is a wasteful number, since it uses less digits than its factorization.

79774128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2770 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 79774128 is about 8931.6363562339. The cubic root of 79774128 is about 430.4810336960.

The spelling of 79774128 in words is "seventy-nine million, seven hundred seventy-four thousand, one hundred twenty-eight".