28159924 has 12 divisors (see below), whose sum is σ = 53070724. Its totient is φ = 12996864.

The previous prime is 28159897. The next prime is 28159927. The reversal of 28159924 is 42995182.

It can be written as a sum of positive squares in 2 ways, for example, as 10368400 + 17791524 = 3220^2 + 4218^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28159927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270717 + ... + 270820.

Almost surely, 2^28159924 is an apocalyptic number.

It is an amenable number.

28159924 is a deficient number, since it is larger than the sum of its proper divisors (24910800).

28159924 is a wasteful number, since it uses less digits than its factorization.

28159924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541554 (or 541552 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 28159924 is about 5306.5925036694. The cubic root of 28159924 is about 304.2359231633.

The spelling of 28159924 in words is "twenty-eight million, one hundred fifty-nine thousand, nine hundred twenty-four".