90636559 has 6 divisors (see below), whose sum is σ = 98145096. Its totient is φ = 83664360.

The previous prime is 90636547. The next prime is 90636563. The reversal of 90636559 is 95563609.

It is a happy number.

It is not a de Polignac number, because 90636559 - 2⁷ = 90636431 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 (90636589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 267987 + ... + 268324.

It is an arithmetic number, because the mean of its divisors is an integer number (16357516).

Almost surely, 2^90636559 is an apocalyptic number.

90636559 is a deficient number, since it is larger than the sum of its proper divisors (7508537).

90636559 is a wasteful number, since it uses less digits than its factorization.

90636559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536337 (or 536324 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 90636559 is about 9520.3234713953. The cubic root of 90636559 is about 449.1945410551.

The spelling of 90636559 in words is "ninety million, six hundred thirty-six thousand, five hundred fifty-nine".