90579609 has 12 divisors (see below), whose sum is σ = 131383252. Its totient is φ = 60134400.

The previous prime is 90579607. The next prime is 90579623. The reversal of 90579609 is 90697509.

It can be written as a sum of positive squares in 2 ways, for example, as 23011209 + 67568400 = 4797^2 + 8220^2 .

It is not a de Polignac number, because 90579609 - 2¹ = 90579607 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90579607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18712 + ... + 23049.

Almost surely, 2^90579609 is an apocalyptic number.

It is an amenable number.

90579609 is a deficient number, since it is larger than the sum of its proper divisors (40803643).

90579609 is a wasteful number, since it uses less digits than its factorization.

90579609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42008 (or 42005 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 45.

The square root of 90579609 is about 9517.3320316147. The cubic root of 90579609 is about 449.1004399948.

The spelling of 90579609 in words is "ninety million, five hundred seventy-nine thousand, six hundred nine".