28109094 has 48 divisors (see below), whose sum is σ = 64123200. Its totient is φ = 8188128.

The previous prime is 28109087. The next prime is 28109111. The reversal of 28109094 is 49090182.

It is a Curzon number.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 18537 + ... + 19995.

It is an arithmetic number, because the mean of its divisors is an integer number (1335900).

Almost surely, 2^28109094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28109094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32061600).

28109094 is an abundant number, since it is smaller than the sum of its proper divisors (36014106).

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

28109094 is a wasteful number, since it uses less digits than its factorization.

28109094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 28109094 is about 5301.8010147496. The cubic root of 28109094 is about 304.0527594834.

The spelling of 28109094 in words is "twenty-eight million, one hundred nine thousand, ninety-four".