90478089 has 12 divisors (see below), whose sum is σ = 140743876. Its totient is φ = 55678752.

The previous prime is 90478081. The next prime is 90478109. The reversal of 90478089 is 98087409.

It can be written as a sum of positive squares in 2 ways, for example, as 60140025 + 30338064 = 7755^2 + 5508^2 .

It is not a de Polignac number, because 90478089 - 2³ = 90478081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90478081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 386542 + ... + 386775.

Almost surely, 2^90478089 is an apocalyptic number.

It is an amenable number.

90478089 is a deficient number, since it is larger than the sum of its proper divisors (50265787).

90478089 is a wasteful number, since it uses less digits than its factorization.

90478089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773336 (or 773333 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 90478089 is about 9511.9971089146. The cubic root of 90478089 is about 448.9325960362.

The spelling of 90478089 in words is "ninety million, four hundred seventy-eight thousand, eighty-nine".