79661328 has 80 divisors (see below), whose sum is σ = 218557440. Its totient is φ = 24948352.

The previous prime is 79661321. The next prime is 79661341. The reversal of 79661328 is 82316697.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 79661328.

It is not an unprimeable number, because it can be changed into a prime (79661321) 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, 64525 + ... + 65747.

It is an arithmetic number, because the mean of its divisors is an integer number (2731968).

Almost surely, 2^79661328 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 79661328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109278720).

79661328 is an abundant number, since it is smaller than the sum of its proper divisors (138896112).

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

79661328 is a wasteful number, since it uses less digits than its factorization.

79661328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1310 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 79661328 is about 8925.3194900799. The cubic root of 79661328 is about 430.2780390376.

The spelling of 79661328 in words is "seventy-nine million, six hundred sixty-one thousand, three hundred twenty-eight".