90478233 has 18 divisors (see below), whose sum is σ = 138558654. Its totient is φ = 56696832.

The previous prime is 90478183. The next prime is 90478249. The reversal of 90478233 is 33287409.

It can be written as a sum of positive squares in 3 ways, for example, as 15776784 + 74701449 = 3972^2 + 8643^2 .

It is not a de Polignac number, because 90478233 - 2⁶ = 90478169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90478253) 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 17 ways as a sum of consecutive naturals, for example, 117273 + ... + 118041.

It is an arithmetic number, because the mean of its divisors is an integer number (7697703).

Almost surely, 2^90478233 is an apocalyptic number.

It is an amenable number.

90478233 is a deficient number, since it is larger than the sum of its proper divisors (48080421).

90478233 is an equidigital number, since it uses as much as digits as its factorization.

90478233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 90478233 is about 9512.0046782999. The cubic root of 90478233 is about 448.9328342016.

The spelling of 90478233 in words is "ninety million, four hundred seventy-eight thousand, two hundred thirty-three".