79391010690 has 48 divisors (see below), whose sum is σ = 206461347768. Its totient is φ = 21166349568.

The previous prime is 79391010623. The next prime is 79391010739. The reversal of 79391010690 is 9601019397.

79391010690 is a `hidden beast` number, since 79 + 391 + 0 + 106 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 61847213481 + 17543797209 = 248691^2 + 132453^2 .

It is a super-2 number, since 2×79391010690² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 332782 + ... + 519158.

Almost surely, 2^79391010690 is an apocalyptic number.

79391010690 is an abundant number, since it is smaller than the sum of its proper divisors (127070337078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79391010690 is a wasteful number, since it uses less digits than its factorization.

79391010690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191123 (or 191120 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The spelling of 79391010690 in words is "seventy-nine billion, three hundred ninety-one million, ten thousand, six hundred ninety".