90028501 has 4 divisors (see below), whose sum is σ = 90047500. Its totient is φ = 90009504.

The previous prime is 90028487. The next prime is 90028507. The reversal of 90028501 is 10582009.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10582009 = 3253².

It can be written as a sum of positive squares in 2 ways, for example, as 56400100 + 33628401 = 7510^2 + 5799^2 .

It is a cyclic number.

It is not a de Polignac number, because 90028501 - 2¹⁹ = 89504213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90028507) 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 3 ways as a sum of consecutive naturals, for example, 4075 + ... + 14023.

It is an arithmetic number, because the mean of its divisors is an integer number (22511875).

Almost surely, 2^90028501 is an apocalyptic number.

It is an amenable number.

90028501 is a deficient number, since it is larger than the sum of its proper divisors (18999).

90028501 is an equidigital number, since it uses as much as digits as its factorization.

90028501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18998.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 90028501 is about 9488.3349961940. The cubic root of 90028501 is about 448.1877750396.

The spelling of 90028501 in words is "ninety million, twenty-eight thousand, five hundred one".