28287090 has 64 divisors (see below), whose sum is σ = 81244800. Its totient is φ = 6962112.

The previous prime is 28287073. The next prime is 28287113. The reversal of 28287090 is 9078282.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 520 + ... + 7539.

It is an arithmetic number, because the mean of its divisors is an integer number (1269450).

Almost surely, 2^28287090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28287090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40622400).

28287090 is an abundant number, since it is smaller than the sum of its proper divisors (52957710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28287090 is a wasteful number, since it uses less digits than its factorization.

28287090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8088 (or 8082 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28287090 is about 5318.5608955807. The cubic root of 28287090 is about 304.6931968166.

The spelling of 28287090 in words is "twenty-eight million, two hundred eighty-seven thousand, ninety".