79128969 has 4 divisors (see below), whose sum is σ = 105505296. Its totient is φ = 52752644.

The previous prime is 79128953. The next prime is 79128979. The reversal of 79128969 is 96982197.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79128969 - 2⁴ = 79128953 is a prime.

It is a super-2 number, since 2×79128969² = 12522787470005922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79128979) 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, 13188159 + ... + 13188164.

It is an arithmetic number, because the mean of its divisors is an integer number (26376324).

Almost surely, 2^79128969 is an apocalyptic number.

It is an amenable number.

79128969 is a deficient number, since it is larger than the sum of its proper divisors (26376327).

79128969 is a wasteful number, since it uses less digits than its factorization.

79128969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26376326.

The product of its digits is 489888, while the sum is 51.

The square root of 79128969 is about 8895.4465317937. The cubic root of 79128969 is about 429.3174117045.

The spelling of 79128969 in words is "seventy-nine million, one hundred twenty-eight thousand, nine hundred sixty-nine".