28513924 has 24 divisors (see below), whose sum is σ = 51787008. Its totient is φ = 13722720.

The previous prime is 28513921. The next prime is 28513943. The reversal of 28513924 is 42931582.

It is a self number, because there is not a number n which added to its sum of digits gives 28513924.

It is not an unprimeable number, because it can be changed into a prime (28513921) by changing a digit.

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, 27642 + ... + 28654.

It is an arithmetic number, because the mean of its divisors is an integer number (2157792).

Almost surely, 2^28513924 is an apocalyptic number.

It is an amenable number.

28513924 is a deficient number, since it is larger than the sum of its proper divisors (23273084).

28513924 is a wasteful number, since it uses less digits than its factorization.

28513924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275 (or 1273 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 28513924 is about 5339.8430688551. The cubic root of 28513924 is about 305.5054737435.

The spelling of 28513924 in words is "twenty-eight million, five hundred thirteen thousand, nine hundred twenty-four".