28289124 has 18 divisors (see below), whose sum is σ = 71508710. Its totient is φ = 9429696.

The previous prime is 28289117. The next prime is 28289137. The reversal of 28289124 is 42198282.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 10497600 = 4218^2 + 3240^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 785809 = 28289124 / (2 + 8 + 2 + 8 + 9 + 1 + 2 + 4).

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 5 ways as a sum of consecutive naturals, for example, 392869 + ... + 392940.

Almost surely, 2^28289124 is an apocalyptic number.

It is an amenable number.

28289124 is an abundant number, since it is smaller than the sum of its proper divisors (43219586).

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

28289124 is a wasteful number, since it uses less digits than its factorization.

28289124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785819 (or 785814 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 28289124 is about 5318.7521092828. The cubic root of 28289124 is about 304.7004996899.

The spelling of 28289124 in words is "twenty-eight million, two hundred eighty-nine thousand, one hundred twenty-four".