90818409 has 16 divisors (see below), whose sum is σ = 132735744. Its totient is φ = 54776400.

The previous prime is 90818407. The next prime is 90818411. The reversal of 90818409 is 90481809.

It is an interprime number because it is at equal distance from previous prime (90818407) and next prime (90818411).

It is not a de Polignac number, because 90818409 - 2¹ = 90818407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90818407) 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, 442 + ... + 13484.

It is an arithmetic number, because the mean of its divisors is an integer number (8295984).

Almost surely, 2^90818409 is an apocalyptic number.

It is an amenable number.

90818409 is a deficient number, since it is larger than the sum of its proper divisors (41917335).

90818409 is a wasteful number, since it uses less digits than its factorization.

90818409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13268.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 90818409 is about 9529.8693065540. The cubic root of 90818409 is about 449.4947564000.

The spelling of 90818409 in words is "ninety million, eight hundred eighteen thousand, four hundred nine".