28194538 has 8 divisors (see below), whose sum is σ = 42923232. Its totient is φ = 13886796.

The previous prime is 28194533. The next prime is 28194553. The reversal of 28194538 is 83549182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28194538.

It is not an unprimeable number, because it can be changed into a prime (28194533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105070 + ... + 105337.

It is an arithmetic number, because the mean of its divisors is an integer number (5365404).

Almost surely, 2^28194538 is an apocalyptic number.

28194538 is a deficient number, since it is larger than the sum of its proper divisors (14728694).

28194538 is a wasteful number, since it uses less digits than its factorization.

28194538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210476.

The product of its digits is 69120, while the sum is 40.

The square root of 28194538 is about 5309.8529169837. The cubic root of 28194538 is about 304.3605270789.

The spelling of 28194538 in words is "twenty-eight million, one hundred ninety-four thousand, five hundred thirty-eight".