90086985 has 20 divisors (see below), whose sum is σ = 161489988. Its totient is φ = 48046176.

The previous prime is 90086977. The next prime is 90086989. The reversal of 90086985 is 58968009.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 69755904 = 4509^2 + 8352^2 .

It is not a de Polignac number, because 90086985 - 2³ = 90086977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90086985.

It is not an unprimeable number, because it can be changed into a prime (90086989) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 110814 + ... + 111623.

Almost surely, 2^90086985 is an apocalyptic number.

It is an amenable number.

90086985 is a deficient number, since it is larger than the sum of its proper divisors (71403003).

90086985 is a wasteful number, since it uses less digits than its factorization.

90086985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222454 (or 222445 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 90086985 is about 9491.4163853452. The cubic root of 90086985 is about 448.2848040905.

The spelling of 90086985 in words is "ninety million, eighty-six thousand, nine hundred eighty-five".