28198816 has 24 divisors (see below), whose sum is σ = 56873124. Its totient is φ = 13754880.

The previous prime is 28198799. The next prime is 28198823. The reversal of 28198816 is 61889182.

It can be written as a sum of positive squares in 2 ways, for example, as 21123216 + 7075600 = 4596^2 + 2660^2 .

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, 9435 + ... + 12058.

Almost surely, 2^28198816 is an apocalyptic number.

It is an amenable number.

28198816 is an abundant number, since it is smaller than the sum of its proper divisors (28674308).

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

28198816 is a wasteful number, since it uses less digits than its factorization.

28198816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21544 (or 21536 counting only the distinct ones).

The product of its digits is 55296, while the sum is 43.

The square root of 28198816 is about 5310.2557377211. The cubic root of 28198816 is about 304.3759199952.

The spelling of 28198816 in words is "twenty-eight million, one hundred ninety-eight thousand, eight hundred sixteen".