28143825 has 12 divisors (see below), whose sum is σ = 46531248. Its totient is φ = 15010000.

The previous prime is 28143809. The next prime is 28143827. The reversal of 28143825 is 52834182.

It is not a de Polignac number, because 28143825 - 2⁴ = 28143809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28143827) 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 11 ways as a sum of consecutive naturals, for example, 187551 + ... + 187700.

It is an arithmetic number, because the mean of its divisors is an integer number (3877604).

Almost surely, 2^28143825 is an apocalyptic number.

28143825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28143825 is a deficient number, since it is larger than the sum of its proper divisors (18387423).

28143825 is a wasteful number, since it uses less digits than its factorization.

28143825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375264 (or 375259 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 28143825 is about 5305.0754000297. The cubic root of 28143825 is about 304.1779349884.

The spelling of 28143825 in words is "twenty-eight million, one hundred forty-three thousand, eight hundred twenty-five".