28198870 has 32 divisors (see below), whose sum is σ = 58621248. Its totient is φ = 9566208.

The previous prime is 28198853. The next prime is 28198931. The reversal of 28198870 is 7889182.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4714 + ... + 8866.

It is an arithmetic number, because the mean of its divisors is an integer number (1831914).

Almost surely, 2^28198870 is an apocalyptic number.

28198870 is an abundant number, since it is smaller than the sum of its proper divisors (30422378).

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

28198870 is a wasteful number, since it uses less digits than its factorization.

28198870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 28198870 is about 5310.2608222196. The cubic root of 28198870 is about 304.3761142857.

The spelling of 28198870 in words is "twenty-eight million, one hundred ninety-eight thousand, eight hundred seventy".