79442787 has 4 divisors (see below), whose sum is σ = 105923720. Its totient is φ = 52961856.

The previous prime is 79442749. The next prime is 79442791. The reversal of 79442787 is 78724497.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79442787 - 2¹⁰ = 79441763 is a prime.

It is a super-2 number, since 2×79442787² = 12622312812654738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79442087) 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, 13240462 + ... + 13240467.

It is an arithmetic number, because the mean of its divisors is an integer number (26480930).

Almost surely, 2^79442787 is an apocalyptic number.

79442787 is a deficient number, since it is larger than the sum of its proper divisors (26480933).

79442787 is a wasteful number, since it uses less digits than its factorization.

79442787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26480932.

The product of its digits is 790272, while the sum is 48.

The square root of 79442787 is about 8913.0683269007. The cubic root of 79442787 is about 429.8842071485.

It can be divided in two parts, 7944 and 2787, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 79442787 in words is "seventy-nine million, four hundred forty-two thousand, seven hundred eighty-seven".