28198115 has 16 divisors (see below), whose sum is σ = 38520576. Its totient is φ = 19615200.

The previous prime is 28198111. The next prime is 28198129. The reversal of 28198115 is 51189182.

It is not a de Polignac number, because 28198115 - 2² = 28198111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28198111) by changing a digit.

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, 9881 + ... + 12410.

It is an arithmetic number, because the mean of its divisors is an integer number (2407536).

Almost surely, 2^28198115 is an apocalyptic number.

28198115 is a deficient number, since it is larger than the sum of its proper divisors (10322461).

28198115 is a wasteful number, since it uses less digits than its factorization.

28198115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22330.

The product of its digits is 5760, while the sum is 35.

The square root of 28198115 is about 5310.1897329568. The cubic root of 28198115 is about 304.3733977937.

The spelling of 28198115 in words is "twenty-eight million, one hundred ninety-eight thousand, one hundred fifteen".