79861857 has 8 divisors (see below), whose sum is σ = 106925280. Its totient is φ = 53019840.

The previous prime is 79861843. The next prime is 79861867. The reversal of 79861857 is 75816897.

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

It is not a de Polignac number, because 79861857 - 2⁴ = 79861841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79861867) 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, 54507 + ... + 55952.

It is an arithmetic number, because the mean of its divisors is an integer number (13365660).

Almost surely, 2^79861857 is an apocalyptic number.

It is an amenable number.

79861857 is a deficient number, since it is larger than the sum of its proper divisors (27063423).

79861857 is a wasteful number, since it uses less digits than its factorization.

79861857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110703.

The product of its digits is 846720, while the sum is 51.

The square root of 79861857 is about 8936.5461449041. The cubic root of 79861857 is about 430.6387783857.

The spelling of 79861857 in words is "seventy-nine million, eight hundred sixty-one thousand, eight hundred fifty-seven".