28993424 has 10 divisors (see below), whose sum is σ = 56174790. Its totient is φ = 14496704.

The previous prime is 28993421. The next prime is 28993429. The reversal of 28993424 is 42439982.

It can be written as a sum of positive squares in only one way, i.e., 21529600 + 7463824 = 4640^2 + 2732^2 .

It is not an unprimeable number, because it can be changed into a prime (28993421) 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 as a sum of consecutive naturals, namely, 906029 + ... + 906060.

It is an arithmetic number, because the mean of its divisors is an integer number (5617479).

Almost surely, 2^28993424 is an apocalyptic number.

It is an amenable number.

28993424 is a deficient number, since it is larger than the sum of its proper divisors (27181366).

28993424 is a wasteful number, since it uses less digits than its factorization.

28993424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812097 (or 1812091 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 28993424 is about 5384.5542062459. The cubic root of 28993424 is about 307.2084583355.

The spelling of 28993424 in words is "twenty-eight million, nine hundred ninety-three thousand, four hundred twenty-four".