79979077 has 4 divisors (see below), whose sum is σ = 80712940. Its totient is φ = 79245216.

The previous prime is 79979059. The next prime is 79979087. The reversal of 79979077 is 77097997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77097997 = 2161 ⋅35677.

It can be written as a sum of positive squares in 2 ways, for example, as 63584676 + 16394401 = 7974^2 + 4049^2 .

It is a cyclic number.

It is not a de Polignac number, because 79979077 - 2⁷ = 79978949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79979087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366768 + ... + 366985.

It is an arithmetic number, because the mean of its divisors is an integer number (20178235).

Almost surely, 2^79979077 is an apocalyptic number.

It is an amenable number.

79979077 is a deficient number, since it is larger than the sum of its proper divisors (733863).

79979077 is a wasteful number, since it uses less digits than its factorization.

79979077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733862.

The product of its (nonzero) digits is 1750329, while the sum is 55.

The square root of 79979077 is about 8943.1022022562. The cubic root of 79979077 is about 430.8493703669.

The spelling of 79979077 in words is "seventy-nine million, nine hundred seventy-nine thousand, seventy-seven".