90840378185 has 16 divisors (see below), whose sum is σ = 111097792080. Its totient is φ = 71292614400.

The previous prime is 90840378163. The next prime is 90840378191. The reversal of 90840378185 is 58187304809.

It can be written as a sum of positive squares in 8 ways, for example, as 16884663481 + 73955714704 = 129941^2 + 271948^2 .

It is not a de Polignac number, because 90840378185 - 2²² = 90836183881 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 770102 + ... + 880191.

It is an arithmetic number, because the mean of its divisors is an integer number (6943612005).

Almost surely, 2^90840378185 is an apocalyptic number.

It is an amenable number.

90840378185 is a deficient number, since it is larger than the sum of its proper divisors (20257413895).

90840378185 is a wasteful number, since it uses less digits than its factorization.

90840378185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650508.

The product of its (nonzero) digits is 1935360, while the sum is 53.

The spelling of 90840378185 in words is "ninety billion, eight hundred forty million, three hundred seventy-eight thousand, one hundred eighty-five".