28145186 has 4 divisors (see below), whose sum is σ = 42217782. Its totient is φ = 14072592.

The previous prime is 28145153. The next prime is 28145203. The reversal of 28145186 is 68154182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27300625 + 844561 = 5225^2 + 919^2 .

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 as a sum of consecutive naturals, namely, 7036295 + ... + 7036298.

Almost surely, 2^28145186 is an apocalyptic number.

28145186 is a deficient number, since it is larger than the sum of its proper divisors (14072596).

28145186 is a wasteful number, since it uses less digits than its factorization.

28145186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14072595.

The product of its digits is 15360, while the sum is 35.

The square root of 28145186 is about 5305.2036718678. The cubic root of 28145186 is about 304.1828381302.

It can be divided in two parts, 2814 and 5186, that added together give a cube (8000 = 20³).

The spelling of 28145186 in words is "twenty-eight million, one hundred forty-five thousand, one hundred eighty-six".