79881823 has 16 divisors (see below), whose sum is σ = 94961664. Its totient is φ = 65753280.

The previous prime is 79881821. The next prime is 79881839. The reversal of 79881823 is 32818897.

It is a cyclic number.

It is not a de Polignac number, because 79881823 - 2¹ = 79881821 is a prime.

It is a super-2 number, since 2×79881823² = 12762211291606658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79881821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28386 + ... + 31072.

It is an arithmetic number, because the mean of its divisors is an integer number (5935104).

Almost surely, 2^79881823 is an apocalyptic number.

79881823 is a deficient number, since it is larger than the sum of its proper divisors (15079841).

79881823 is a wasteful number, since it uses less digits than its factorization.

79881823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862.

The product of its digits is 193536, while the sum is 46.

The square root of 79881823 is about 8937.6631733356. The cubic root of 79881823 is about 430.6746629233.

It can be divided in two parts, 798 and 81823, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 79881823 in words is "seventy-nine million, eight hundred eighty-one thousand, eight hundred twenty-three".