79447869 has 6 divisors (see below), whose sum is σ = 114758046. Its totient is φ = 52965240.

The previous prime is 79447859. The next prime is 79447883. The reversal of 79447869 is 96874497.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 45400644 + 34047225 = 6738^2 + 5835^2 .

It is not a de Polignac number, because 79447869 - 2⁷ = 79447741 is a prime.

It is a super-2 number, since 2×79447869² = 12623927777282322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79447859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4413762 + ... + 4413779.

It is an arithmetic number, because the mean of its divisors is an integer number (19126341).

Almost surely, 2^79447869 is an apocalyptic number.

It is an amenable number.

79447869 is a deficient number, since it is larger than the sum of its proper divisors (35310177).

79447869 is a wasteful number, since it uses less digits than its factorization.

79447869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8827547 (or 8827544 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 79447869 is about 8913.3534093516. The cubic root of 79447869 is about 429.8933735983.

The spelling of 79447869 in words is "seventy-nine million, four hundred forty-seven thousand, eight hundred sixty-nine".