90020889 has 60 divisors (see below), whose sum is σ = 160920804. Its totient is φ = 49968576.

The previous prime is 90020881. The next prime is 90020897. The reversal of 90020889 is 98802009.

It is an interprime number because it is at equal distance from previous prime (90020881) and next prime (90020897).

It can be written as a sum of positive squares in 2 ways, for example, as 32867289 + 57153600 = 5733^2 + 7560^2 .

It is not a de Polignac number, because 90020889 - 2³ = 90020881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90020881) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 146547 + ... + 147159.

Almost surely, 2^90020889 is an apocalyptic number.

It is an amenable number.

90020889 is a deficient number, since it is larger than the sum of its proper divisors (70899915).

90020889 is a wasteful number, since it uses less digits than its factorization.

90020889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 90020889 is about 9487.9338635975. The cubic root of 90020889 is about 448.1751431084.

It can be divided in two parts, 90020 and 889, that added together give a palindrome (90909).

The spelling of 90020889 in words is "ninety million, twenty thousand, eight hundred eighty-nine".