90665588 has 12 divisors (see below), whose sum is σ = 170869860. Its totient is φ = 41845632.

The previous prime is 90665537. The next prime is 90665611. The reversal of 90665588 is 88556609.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53553124 + 37112464 = 7318^2 + 6092^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871733 + ... + 871836.

It is an arithmetic number, because the mean of its divisors is an integer number (14239155).

Almost surely, 2^90665588 is an apocalyptic number.

It is an amenable number.

90665588 is a deficient number, since it is larger than the sum of its proper divisors (80204272).

90665588 is a wasteful number, since it uses less digits than its factorization.

90665588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743586 (or 1743584 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The square root of 90665588 is about 9521.8479298926. The cubic root of 90665588 is about 449.2424918181.

The spelling of 90665588 in words is "ninety million, six hundred sixty-five thousand, five hundred eighty-eight".