28143924 has 12 divisors (see below), whose sum is σ = 65669184. Its totient is φ = 9381304.

The previous prime is 28143911. The next prime is 28143943. The reversal of 28143924 is 42934182.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

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 3 ways as a sum of consecutive naturals, for example, 1172652 + ... + 1172675.

It is an arithmetic number, because the mean of its divisors is an integer number (5472432).

Almost surely, 2^28143924 is an apocalyptic number.

It is an amenable number.

28143924 is an abundant number, since it is smaller than the sum of its proper divisors (37525260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28143924 is a wasteful number, since it uses less digits than its factorization.

28143924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345334 (or 2345332 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 28143924 is about 5305.0847307088. The cubic root of 28143924 is about 304.1782916514.

The spelling of 28143924 in words is "twenty-eight million, one hundred forty-three thousand, nine hundred twenty-four".