90090065 has 16 divisors (see below), whose sum is σ = 116898768. Its totient is φ = 66256896.

The previous prime is 90090053. The next prime is 90090097. The reversal of 90090065 is 56009009.

It can be written as a sum of positive squares in 8 ways, for example, as 10452289 + 79637776 = 3233^2 + 8924^2 .

It is a cyclic number.

It is not a de Polignac number, because 90090065 - 2¹⁸ = 89827921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14009 + ... + 19401.

It is an arithmetic number, because the mean of its divisors is an integer number (7306173).

Almost surely, 2^90090065 is an apocalyptic number.

It is an amenable number.

90090065 is a deficient number, since it is larger than the sum of its proper divisors (26808703).

90090065 is a wasteful number, since it uses less digits than its factorization.

90090065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5668.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 90090065 is about 9491.5786358224. The cubic root of 90090065 is about 448.2899128620.

The spelling of 90090065 in words is "ninety million, ninety thousand, sixty-five".