90817909 has 16 divisors (see below), whose sum is σ = 112170240. Its totient is φ = 71602560.

The previous prime is 90817901. The next prime is 90817919. The reversal of 90817909 is 90971809.

It is a cyclic number.

It is not a de Polignac number, because 90817909 - 2³ = 90817901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90817901) 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, 26697 + ... + 29905.

It is an arithmetic number, because the mean of its divisors is an integer number (7010640).

Almost surely, 2^90817909 is an apocalyptic number.

It is an amenable number.

90817909 is a deficient number, since it is larger than the sum of its proper divisors (21352331).

90817909 is a wasteful number, since it uses less digits than its factorization.

90817909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 90817909 is about 9529.8430732095. The cubic root of 90817909 is about 449.4939315019.

The spelling of 90817909 in words is "ninety million, eight hundred seventeen thousand, nine hundred nine".