90045865 has 32 divisors (see below), whose sum is σ = 134862336. Its totient is φ = 56194560.

The previous prime is 90045833. The next prime is 90045911. The reversal of 90045865 is 56854009.

It is not a de Polignac number, because 90045865 - 2⁵ = 90045833 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31860 + ... + 34570.

It is an arithmetic number, because the mean of its divisors is an integer number (4214448).

Almost surely, 2^90045865 is an apocalyptic number.

90045865 is the 4745-th decagonal number.

It is an amenable number.

90045865 is a deficient number, since it is larger than the sum of its proper divisors (44816471).

90045865 is a wasteful number, since it uses less digits than its factorization.

90045865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 90045865 is about 9489.2499703612. The cubic root of 90045865 is about 448.2165875163.

The spelling of 90045865 in words is "ninety million, forty-five thousand, eight hundred sixty-five".