90172233 has 24 divisors (see below), whose sum is σ = 145173600. Its totient is φ = 53599104.

The previous prime is 90172193. The next prime is 90172253. The reversal of 90172233 is 33227109.

It is not a de Polignac number, because 90172233 - 2⁶ = 90172169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90172197 and 90172206.

It is not an unprimeable number, because it can be changed into a prime (90172253) 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 23 ways as a sum of consecutive naturals, for example, 12603 + ... + 18416.

It is an arithmetic number, because the mean of its divisors is an integer number (6048900).

Almost surely, 2^90172233 is an apocalyptic number.

It is an amenable number.

90172233 is a deficient number, since it is larger than the sum of its proper divisors (55001367).

90172233 is a wasteful number, since it uses less digits than its factorization.

90172233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31061 (or 31058 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 90172233 is about 9495.9061179015. The cubic root of 90172233 is about 448.4261613024.

The spelling of 90172233 in words is "ninety million, one hundred seventy-two thousand, two hundred thirty-three".