28191106 has 16 divisors (see below), whose sum is σ = 43183800. Its totient is φ = 13799808.

The previous prime is 28191091. The next prime is 28191113. The reversal of 28191106 is 60119182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27615025 + 576081 = 5255^2 + 759^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18676 + ... + 20128.

Almost surely, 2^28191106 is an apocalyptic number.

28191106 is a deficient number, since it is larger than the sum of its proper divisors (14992694).

28191106 is a wasteful number, since it uses less digits than its factorization.

28191106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 28191106 is about 5309.5297343550. The cubic root of 28191106 is about 304.3481770780.

The spelling of 28191106 in words is "twenty-eight million, one hundred ninety-one thousand, one hundred six".