90028309 has 16 divisors (see below), whose sum is σ = 107053056. Its totient is φ = 74084400.

The previous prime is 90028303. The next prime is 90028313. The reversal of 90028309 is 90382009.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 90028309 - 2⁷ = 90028181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90028303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26844 + ... + 30010.

It is an arithmetic number, because the mean of its divisors is an integer number (6690816).

Almost surely, 2^90028309 is an apocalyptic number.

It is an amenable number.

90028309 is a deficient number, since it is larger than the sum of its proper divisors (17024747).

90028309 is a wasteful number, since it uses less digits than its factorization.

90028309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 90028309 is about 9488.3248785020. The cubic root of 90028309 is about 448.1874564290.

The spelling of 90028309 in words is "ninety million, twenty-eight thousand, three hundred nine".