90088081 has 4 divisors (see below), whose sum is σ = 92522932. Its totient is φ = 87653232.

The previous prime is 90088073. The next prime is 90088087. The reversal of 90088081 is 18088009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18088009 = 4253².

It can be written as a sum of positive squares in 2 ways, for example, as 61089856 + 28998225 = 7816^2 + 5385^2 .

It is a cyclic number.

It is not a de Polignac number, because 90088081 - 2³ = 90088073 is a prime.

It is a super-2 number, since 2×90088081² = 16231724676525122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90088087) 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, 1217370 + ... + 1217443.

It is an arithmetic number, because the mean of its divisors is an integer number (23130733).

Almost surely, 2^90088081 is an apocalyptic number.

It is an amenable number.

90088081 is a deficient number, since it is larger than the sum of its proper divisors (2434851).

90088081 is a wasteful number, since it uses less digits than its factorization.

90088081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434850.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 90088081 is about 9491.4741215472. The cubic root of 90088081 is about 448.2866220303.

The spelling of 90088081 in words is "ninety million, eighty-eight thousand, eighty-one".