90808605 has 24 divisors (see below), whose sum is σ = 158285400. Its totient is φ = 48159360.

The previous prime is 90808591. The next prime is 90808607. The reversal of 90808605 is 50680809.

It can be written as a sum of positive squares in 4 ways, for example, as 1279161 + 89529444 = 1131^2 + 9462^2 .

It is not a de Polignac number, because 90808605 - 2⁷ = 90808477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90808605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90808607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2571 + ... + 13719.

It is an arithmetic number, because the mean of its divisors is an integer number (6595225).

Almost surely, 2^90808605 is an apocalyptic number.

It is an amenable number.

90808605 is a deficient number, since it is larger than the sum of its proper divisors (67476795).

90808605 is a wasteful number, since it uses less digits than its factorization.

90808605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11341 (or 11338 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 90808605 is about 9529.3549099611. The cubic root of 90808605 is about 449.4785812463.

The spelling of 90808605 in words is "ninety million, eight hundred eight thousand, six hundred five".