79157647 has 4 divisors (see below), whose sum is σ = 79437640. Its totient is φ = 78877656.

The previous prime is 79157609. The next prime is 79157671. The reversal of 79157647 is 74675197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74675197 = 3769 ⋅19813.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79157647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79157597 and 79157606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79157677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139572 + ... + 140137.

It is an arithmetic number, because the mean of its divisors is an integer number (19859410).

Almost surely, 2^79157647 is an apocalyptic number.

79157647 is a deficient number, since it is larger than the sum of its proper divisors (279993).

79157647 is a wasteful number, since it uses less digits than its factorization.

79157647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279992.

The product of its digits is 370440, while the sum is 46.

The square root of 79157647 is about 8897.0583340787. The cubic root of 79157647 is about 429.3692699886.

The spelling of 79157647 in words is "seventy-nine million, one hundred fifty-seven thousand, six hundred forty-seven".