79857617 has 4 divisors (see below), whose sum is σ = 91265856. Its totient is φ = 68449380.

The previous prime is 79857611. The next prime is 79857623. The reversal of 79857617 is 71675897.

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.

It is an interprime number because it is at equal distance from previous prime (79857611) and next prime (79857623).

It is a cyclic number.

It is not a de Polignac number, because 79857617 - 2¹⁰ = 79856593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79857611) 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, 5704109 + ... + 5704122.

It is an arithmetic number, because the mean of its divisors is an integer number (22816464).

Almost surely, 2^79857617 is an apocalyptic number.

It is an amenable number.

79857617 is a deficient number, since it is larger than the sum of its proper divisors (11408239).

79857617 is a wasteful number, since it uses less digits than its factorization.

79857617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11408238.

The product of its digits is 740880, while the sum is 50.

The square root of 79857617 is about 8936.3089136399. The cubic root of 79857617 is about 430.6311571391.

The spelling of 79857617 in words is "seventy-nine million, eight hundred fifty-seven thousand, six hundred seventeen".