90605689 has 2 divisors, whose sum is σ = 90605690. Its totient is φ = 90605688.

The previous prime is 90605681. The next prime is 90605693. The reversal of 90605689 is 98650609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90573289 + 32400 = 9517^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 90605689 - 2³ = 90605681 is a prime.

It is not a weakly prime, because it can be changed into another prime (90605681) 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 as a sum of consecutive naturals, namely, 45302844 + 45302845.

It is an arithmetic number, because the mean of its divisors is an integer number (45302845).

Almost surely, 2^90605689 is an apocalyptic number.

It is an amenable number.

90605689 is a deficient number, since it is larger than the sum of its proper divisors (1).

90605689 is an equidigital number, since it uses as much as digits as its factorization.

90605689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 90605689 is about 9518.7020648826. The cubic root of 90605689 is about 449.1435380522.

The spelling of 90605689 in words is "ninety million, six hundred five thousand, six hundred eighty-nine".