28128735 has 32 divisors (see below), whose sum is σ = 50400000. Its totient is φ = 14884128.

The previous prime is 28128719. The next prime is 28128787. The reversal of 28128735 is 53782182.

It is not a de Polignac number, because 28128735 - 2⁴ = 28128719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28128735.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18016 + ... + 19514.

It is an arithmetic number, because the mean of its divisors is an integer number (1575000).

Almost surely, 2^28128735 is an apocalyptic number.

28128735 is a deficient number, since it is larger than the sum of its proper divisors (22271265).

28128735 is a wasteful number, since it uses less digits than its factorization.

28128735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 1646 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 28128735 is about 5303.6529863859. The cubic root of 28128735 is about 304.1235611232.

The spelling of 28128735 in words is "twenty-eight million, one hundred twenty-eight thousand, seven hundred thirty-five".