90738609 has 16 divisors (see below), whose sum is σ = 130540032. Its totient is φ = 55732608.

The previous prime is 90738607. The next prime is 90738619. The reversal of 90738609 is 90683709.

It is a happy number.

It is not a de Polignac number, because 90738609 - 2¹ = 90738607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90738607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21757 + ... + 25589.

It is an arithmetic number, because the mean of its divisors is an integer number (8158752).

Almost surely, 2^90738609 is an apocalyptic number.

It is an amenable number.

90738609 is a deficient number, since it is larger than the sum of its proper divisors (39801423).

90738609 is a wasteful number, since it uses less digits than its factorization.

90738609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 90738609 is about 9525.6815504194. The cubic root of 90738609 is about 449.3630643307.

The spelling of 90738609 in words is "ninety million, seven hundred thirty-eight thousand, six hundred nine".