90085881 has 4 divisors (see below), whose sum is σ = 120114512. Its totient is φ = 60057252.

The previous prime is 90085843. The next prime is 90085909. The reversal of 90085881 is 18858009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90085881 - 2⁷ = 90085753 is a prime.

It is a super-2 number, since 2×90085881² = 16230931911092322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90085081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15014311 + ... + 15014316.

It is an arithmetic number, because the mean of its divisors is an integer number (30028628).

Almost surely, 2^90085881 is an apocalyptic number.

It is an amenable number.

90085881 is a deficient number, since it is larger than the sum of its proper divisors (30028631).

90085881 is a wasteful number, since it uses less digits than its factorization.

90085881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30028630.

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 90085881 is about 9491.3582273561. The cubic root of 90085881 is about 448.2829728661.

The spelling of 90085881 in words is "ninety million, eighty-five thousand, eight hundred eighty-one".