28134208 has 42 divisors (see below), whose sum is σ = 57868566. Its totient is φ = 13561344.

The previous prime is 28134181. The next prime is 28134217. The reversal of 28134208 is 80243182.

It can be written as a sum of positive squares in 3 ways, for example, as 15116544 + 13017664 = 3888^2 + 3608^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 258058 + ... + 258166.

It is an arithmetic number, because the mean of its divisors is an integer number (1377823).

Almost surely, 2^28134208 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 28134208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28934283).

28134208 is an abundant number, since it is smaller than the sum of its proper divisors (29734358).

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

28134208 is an equidigital number, since it uses as much as digits as its factorization.

28134208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28134208 is about 5304.1689264200. The cubic root of 28134208 is about 304.1432842558.

It can be divided in two parts, 2813 and 4208, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 28134208 in words is "twenty-eight million, one hundred thirty-four thousand, two hundred eight".