90028 has 12 divisors (see below), whose sum is σ = 160272. Its totient is φ = 44240.

The previous prime is 90023. The next prime is 90031. The reversal of 90028 is 82009.

It is a super-4 number, since 4×90028⁴ (a number of 21 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 89987 and 90014.

It is not an unprimeable number, because it can be changed into a prime (90023) 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 3 ways as a sum of consecutive naturals, for example, 126 + ... + 442.

It is an arithmetic number, because the mean of its divisors is an integer number (13356).

2⁹⁰⁰²⁸ is an apocalyptic number.

It is an amenable number.

90028 is a deficient number, since it is larger than the sum of its proper divisors (70244).

90028 is a wasteful number, since it uses less digits than its factorization.

90028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 90028 is about 300.0466630376. The cubic root of 90028 is about 44.8186943664.

Subtracting from 90028 its sum of digits (19), we obtain a palindrome (90009).

It can be divided in two parts, 900 and 28, that multiplied together give a triangular number (25200 = T₂₂₄).

The spelling of 90028 in words is "ninety thousand, twenty-eight".