79856647 has 4 divisors (see below), whose sum is σ = 85999480. Its totient is φ = 73713816.

The previous prime is 79856641. The next prime is 79856653. The reversal of 79856647 is 74665897.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (79856641) and next prime (79856653).

It is a cyclic number.

It is not a de Polignac number, because 79856647 - 2²³ = 71468039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79856594 and 79856603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79856641) 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, 3071397 + ... + 3071422.

It is an arithmetic number, because the mean of its divisors is an integer number (21499870).

Almost surely, 2^79856647 is an apocalyptic number.

79856647 is a deficient number, since it is larger than the sum of its proper divisors (6142833).

79856647 is a wasteful number, since it uses less digits than its factorization.

79856647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6142832.

The product of its digits is 2540160, while the sum is 52.

The square root of 79856647 is about 8936.2546405080. The cubic root of 79856647 is about 430.6294135612.

The spelling of 79856647 in words is "seventy-nine million, eight hundred fifty-six thousand, six hundred forty-seven".