79907869 has 4 divisors (see below), whose sum is σ = 79977280. Its totient is φ = 79838460.

The previous prime is 79907857. The next prime is 79907879. The reversal of 79907869 is 96870997.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96870997 = 3823 ⋅25339.

It is a cyclic number.

It is not a de Polignac number, because 79907869 - 2⁷ = 79907741 is a prime.

It is a super-2 number, since 2×79907869² = 12770535056242322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79907809) 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, 32949 + ... + 35290.

It is an arithmetic number, because the mean of its divisors is an integer number (19994320).

Almost surely, 2^79907869 is an apocalyptic number.

It is an amenable number.

79907869 is a deficient number, since it is larger than the sum of its proper divisors (69411).

79907869 is a wasteful number, since it uses less digits than its factorization.

79907869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69410.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 79907869 is about 8939.1201468601. The cubic root of 79907869 is about 430.7214659501.

The spelling of 79907869 in words is "seventy-nine million, nine hundred seven thousand, eight hundred sixty-nine".