28194870 has 32 divisors (see below), whose sum is σ = 73820160. Its totient is φ = 6835040.

The previous prime is 28194869. The next prime is 28194919. The reversal of 28194870 is 7849182.

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 15 ways as a sum of consecutive naturals, for example, 42390 + ... + 43049.

It is an arithmetic number, because the mean of its divisors is an integer number (2306880).

Almost surely, 2^28194870 is an apocalyptic number.

28194870 is an abundant number, since it is smaller than the sum of its proper divisors (45625290).

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

28194870 is a wasteful number, since it uses less digits than its factorization.

28194870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85460.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 28194870 is about 5309.8841795278. The cubic root of 28194870 is about 304.3617217228.

The spelling of 28194870 in words is "twenty-eight million, one hundred ninety-four thousand, eight hundred seventy".