79787085787 has 4 divisors (see below), whose sum is σ = 79802205120. Its totient is φ = 79771966456.

The previous prime is 79787085773. The next prime is 79787085797. The reversal of 79787085787 is 78758078797.

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

It is a cyclic number.

It is not a de Polignac number, because 79787085787 - 2⁷ = 79787085659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79787085797) 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, 7551748 + ... + 7562305.

It is an arithmetic number, because the mean of its divisors is an integer number (19950551280).

Almost surely, 2^79787085787 is an apocalyptic number.

79787085787 is a deficient number, since it is larger than the sum of its proper divisors (15119333).

79787085787 is a wasteful number, since it uses less digits than its factorization.

79787085787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15119332.

The product of its (nonzero) digits is 387233280, while the sum is 73.

The spelling of 79787085787 in words is "seventy-nine billion, seven hundred eighty-seven million, eighty-five thousand, seven hundred eighty-seven".