28398894 has 16 divisors (see below), whose sum is σ = 56927568. Its totient is φ = 9444672.

The previous prime is 28398889. The next prime is 28398899. The reversal of 28398894 is 49889382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28398889) and next prime (28398899).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398899) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2437 + ... + 7920.

It is an arithmetic number, because the mean of its divisors is an integer number (3557973).

Almost surely, 2^28398894 is an apocalyptic number.

28398894 is an abundant number, since it is smaller than the sum of its proper divisors (28528674).

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

28398894 is a wasteful number, since it uses less digits than its factorization.

28398894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10819.

The product of its digits is 995328, while the sum is 51.

The square root of 28398894 is about 5329.0612681785. The cubic root of 28398894 is about 305.0940997834.

It can be divided in two parts, 28398 and 894, that added together give a palindrome (29292).

The spelling of 28398894 in words is "twenty-eight million, three hundred ninety-eight thousand, eight hundred ninety-four".