91079618436 has 81 divisors (see below), whose sum is σ = 232349271973. Its totient is φ = 30082825920.

The previous prime is 91079618419. The next prime is 91079618447. The reversal of 91079618436 is 63481697019.

The square root of 91079618436 is 301794.

It is a perfect power (a square), and thus also a powerful number.

91079618436 is a `hidden beast` number, since 9 + 10 + 7 + 9 + 618 + 4 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61550632836 + 29528985600 = 248094^2 + 171840^2 .

It is a Duffinian number.

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 26 ways as a sum of consecutive naturals, for example, 324126616 + ... + 324126896.

Almost surely, 2^91079618436 is an apocalyptic number.

91079618436 is the 301794-th square number.

It is an amenable number.

91079618436 is an abundant number, since it is smaller than the sum of its proper divisors (141269653537).

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

91079618436 is a wasteful number, since it uses less digits than its factorization.

91079618436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 91079618436 in words is "ninety-one billion, seventy-nine million, six hundred eighteen thousand, four hundred thirty-six".