79857647 has 8 divisors (see below), whose sum is σ = 80432352. Its totient is φ = 79285600.

The previous prime is 79857641. The next prime is 79857649. The reversal of 79857647 is 74675897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79857647 - 2²⁴ = 63080431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79857641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143093 + ... + 143649.

It is an arithmetic number, because the mean of its divisors is an integer number (10054044).

Almost surely, 2^79857647 is an apocalyptic number.

79857647 is a deficient number, since it is larger than the sum of its proper divisors (574705).

79857647 is a wasteful number, since it uses less digits than its factorization.

79857647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329.

The product of its digits is 2963520, while the sum is 53.

The square root of 79857647 is about 8936.3105921851. The cubic root of 79857647 is about 430.6312110639.

The spelling of 79857647 in words is "seventy-nine million, eight hundred fifty-seven thousand, six hundred forty-seven".