79857827 has 4 divisors (see below), whose sum is σ = 91266096. Its totient is φ = 68449560.

The previous prime is 79857821. The next prime is 79857847. The reversal of 79857827 is 72875897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72875897 = 47 ⋅1550551.

It is a cyclic number.

It is not a de Polignac number, because 79857827 - 2⁶ = 79857763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79857821) 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, 5704124 + ... + 5704137.

It is an arithmetic number, because the mean of its divisors is an integer number (22816524).

Almost surely, 2^79857827 is an apocalyptic number.

79857827 is a deficient number, since it is larger than the sum of its proper divisors (11408269).

79857827 is a wasteful number, since it uses less digits than its factorization.

79857827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11408268.

The product of its digits is 1975680, while the sum is 53.

The square root of 79857827 is about 8936.3206634498. The cubic root of 79857827 is about 430.6315346128.

The spelling of 79857827 in words is "seventy-nine million, eight hundred fifty-seven thousand, eight hundred twenty-seven".