28198772 has 12 divisors (see below), whose sum is σ = 56397600. Its totient is φ = 12085176.

The previous prime is 28198769. The next prime is 28198783. The reversal of 28198772 is 27789182.

28198772 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503522 + ... + 503577.

It is an arithmetic number, because the mean of its divisors is an integer number (4699800).

Almost surely, 2^28198772 is an apocalyptic number.

It is an amenable number.

28198772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28198772 is a wasteful number, since it uses less digits than its factorization.

28198772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007110 (or 1007108 counting only the distinct ones).

The product of its digits is 112896, while the sum is 44.

The square root of 28198772 is about 5310.2515947928. The cubic root of 28198772 is about 304.3757616842.

The spelling of 28198772 in words is "twenty-eight million, one hundred ninety-eight thousand, seven hundred seventy-two".