90984889 has 4 divisors (see below), whose sum is σ = 91120756. Its totient is φ = 90849024.

The previous prime is 90984827. The next prime is 90984923. The reversal of 90984889 is 98848909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98848909 = 41 ⋅2410949.

It can be written as a sum of positive squares in 2 ways, for example, as 51194025 + 39790864 = 7155^2 + 6308^2 .

It is a cyclic number.

It is not a de Polignac number, because 90984889 - 2¹⁷ = 90853817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90987889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66924 + ... + 68269.

It is an arithmetic number, because the mean of its divisors is an integer number (22780189).

Almost surely, 2^90984889 is an apocalyptic number.

It is an amenable number.

90984889 is a deficient number, since it is larger than the sum of its proper divisors (135867).

90984889 is a wasteful number, since it uses less digits than its factorization.

90984889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135866.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 90984889 is about 9538.5999496781. The cubic root of 90984889 is about 449.7692463020.

The spelling of 90984889 in words is "ninety million, nine hundred eighty-four thousand, eight hundred eighty-nine".