28198445 has 24 divisors (see below), whose sum is σ = 37588992. Its totient is φ = 20291040.

The previous prime is 28198421. The next prime is 28198453. The reversal of 28198445 is 54489182.

It is not a de Polignac number, because 28198445 - 2⁶ = 28198381 is a prime.

It is a Duffinian number.

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 23 ways as a sum of consecutive naturals, for example, 76652 + ... + 77018.

It is an arithmetic number, because the mean of its divisors is an integer number (1566208).

Almost surely, 2^28198445 is an apocalyptic number.

It is an amenable number.

28198445 is a deficient number, since it is larger than the sum of its proper divisors (9390547).

28198445 is a wasteful number, since it uses less digits than its factorization.

28198445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 510 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 28198445 is about 5310.2208052020. The cubic root of 28198445 is about 304.3745851406.

The spelling of 28198445 in words is "twenty-eight million, one hundred ninety-eight thousand, four hundred forty-five".