79866893 has 4 divisors (see below), whose sum is σ = 81814908. Its totient is φ = 77918880.

The previous prime is 79866883. The next prime is 79866949. The reversal of 79866893 is 39866897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39866897 = 7 ⋅5695271.

It can be written as a sum of positive squares in 2 ways, for example, as 19695844 + 60171049 = 4438^2 + 7757^2 .

It is a cyclic number.

It is not a de Polignac number, because 79866893 - 2⁴ = 79866877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79866883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973946 + ... + 974027.

It is an arithmetic number, because the mean of its divisors is an integer number (20453727).

Almost surely, 2^79866893 is an apocalyptic number.

It is an amenable number.

79866893 is a deficient number, since it is larger than the sum of its proper divisors (1948015).

79866893 is a wasteful number, since it uses less digits than its factorization.

79866893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948014.

The product of its digits is 3919104, while the sum is 56.

The square root of 79866893 is about 8936.8279047993. The cubic root of 79866893 is about 430.6478300631.

The spelling of 79866893 in words is "seventy-nine million, eight hundred sixty-six thousand, eight hundred ninety-three".