79787591 has 8 divisors (see below), whose sum is σ = 86029104. Its totient is φ = 73560960.

The previous prime is 79787537. The next prime is 79787597. The reversal of 79787591 is 19578797.

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

It is a cyclic number.

It is not a de Polignac number, because 79787591 - 2¹⁴ = 79771207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79787597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9071 + ... + 15551.

It is an arithmetic number, because the mean of its divisors is an integer number (10753638).

Almost surely, 2^79787591 is an apocalyptic number.

79787591 is a deficient number, since it is larger than the sum of its proper divisors (6241513).

79787591 is a wasteful number, since it uses less digits than its factorization.

79787591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7441.

The product of its digits is 1111320, while the sum is 53.

The square root of 79787591 is about 8932.3899937251. The cubic root of 79787591 is about 430.5052488992.

It can be divided in two parts, 797 and 87591, that added together give a palindrome (88388).

The spelling of 79787591 in words is "seventy-nine million, seven hundred eighty-seven thousand, five hundred ninety-one".