28642198 has 16 divisors (see below), whose sum is σ = 47864880. Its totient is φ = 12763296.

The previous prime is 28642189. The next prime is 28642213. The reversal of 28642198 is 89124682.

It is a self number, because there is not a number n which added to its sum of digits gives 28642198.

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 7 ways as a sum of consecutive naturals, for example, 18240 + ... + 19747.

It is an arithmetic number, because the mean of its divisors is an integer number (2991555).

Almost surely, 2^28642198 is an apocalyptic number.

28642198 is a deficient number, since it is larger than the sum of its proper divisors (19222682).

28642198 is a wasteful number, since it uses less digits than its factorization.

28642198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38031.

The product of its digits is 55296, while the sum is 40.

The square root of 28642198 is about 5351.8406179557. The cubic root of 28642198 is about 305.9629086288.

The spelling of 28642198 in words is "twenty-eight million, six hundred forty-two thousand, one hundred ninety-eight".