79978089 has 8 divisors (see below), whose sum is σ = 106739392. Its totient is φ = 53267760.

The previous prime is 79978079. The next prime is 79978097. The reversal of 79978089 is 98087997.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79978089 - 2²¹ = 77880937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79978079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8917 + ... + 15474.

It is an arithmetic number, because the mean of its divisors is an integer number (13342424).

Almost surely, 2^79978089 is an apocalyptic number.

It is an amenable number.

79978089 is a deficient number, since it is larger than the sum of its proper divisors (26761303).

79978089 is a wasteful number, since it uses less digits than its factorization.

79978089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25487.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 79978089 is about 8943.0469639827. The cubic root of 79978089 is about 430.8475962323.

The spelling of 79978089 in words is "seventy-nine million, nine hundred seventy-eight thousand, eighty-nine".