90792040685 has 4 divisors (see below), whose sum is σ = 108950448828. Its totient is φ = 72633632544.

The previous prime is 90792040681. The next prime is 90792040723. The reversal of 90792040685 is 58604029709.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58604029709 = 45161 ⋅1297669.

It can be written as a sum of positive squares in 2 ways, for example, as 72061107364 + 18730933321 = 268442^2 + 136861^2 .

It is a cyclic number.

It is not a de Polignac number, because 90792040685 - 2² = 90792040681 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 (90792040681) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9079204064 + ... + 9079204073.

It is an arithmetic number, because the mean of its divisors is an integer number (27237612207).

Almost surely, 2^90792040685 is an apocalyptic number.

It is an amenable number.

90792040685 is a deficient number, since it is larger than the sum of its proper divisors (18158408143).

90792040685 is a wasteful number, since it uses less digits than its factorization.

90792040685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18158408142.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 90792040685 in words is "ninety billion, seven hundred ninety-two million, forty thousand, six hundred eighty-five".