90324865 has 4 divisors (see below), whose sum is σ = 108389844. Its totient is φ = 72259888.

The previous prime is 90324863. The next prime is 90324877. The reversal of 90324865 is 56842309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56842309 = 1511 ⋅37619.

It can be written as a sum of positive squares in 2 ways, for example, as 66471409 + 23853456 = 8153^2 + 4884^2 .

It is a cyclic number.

It is not a de Polignac number, because 90324865 - 2¹ = 90324863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90324863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9032482 + ... + 9032491.

It is an arithmetic number, because the mean of its divisors is an integer number (27097461).

Almost surely, 2^90324865 is an apocalyptic number.

It is an amenable number.

90324865 is a deficient number, since it is larger than the sum of its proper divisors (18064979).

90324865 is a wasteful number, since it uses less digits than its factorization.

90324865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18064978.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 90324865 is about 9503.9394463559. The cubic root of 90324865 is about 448.6790314599.

The spelling of 90324865 in words is "ninety million, three hundred twenty-four thousand, eight hundred sixty-five".