28090504 has 48 divisors (see below), whose sum is σ = 57974400. Its totient is φ = 12752064.

The previous prime is 28090501. The next prime is 28090507. The reversal of 28090504 is 40509082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28090501) and next prime (28090507).

It is not an unprimeable number, because it can be changed into a prime (28090501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106677 + ... + 106939.

It is an arithmetic number, because the mean of its divisors is an integer number (1207800).

Almost surely, 2^28090504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28090504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28987200).

28090504 is an abundant number, since it is smaller than the sum of its proper divisors (29883896).

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

28090504 is a wasteful number, since it uses less digits than its factorization.

28090504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 28090504 is about 5300.0475469565. The cubic root of 28090504 is about 303.9857160879.

Adding to 28090504 its reverse (40509082), we get a palindrome (68599586).

The spelling of 28090504 in words is "twenty-eight million, ninety thousand, five hundred four".