28751885 has 4 divisors (see below), whose sum is σ = 34502268. Its totient is φ = 23001504.

The previous prime is 28751873. The next prime is 28751893. The reversal of 28751885 is 58815782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10201636 + 18550249 = 3194^2 + 4307^2 .

It is a cyclic number.

It is not a de Polignac number, because 28751885 - 2⁸ = 28751629 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2875184 + ... + 2875193.

It is an arithmetic number, because the mean of its divisors is an integer number (8625567).

Almost surely, 2^28751885 is an apocalyptic number.

It is an amenable number.

28751885 is a deficient number, since it is larger than the sum of its proper divisors (5750383).

28751885 is an equidigital number, since it uses as much as digits as its factorization.

28751885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750382.

The product of its digits is 179200, while the sum is 44.

The square root of 28751885 is about 5362.0784216570. The cubic root of 28751885 is about 306.3529788353.

The spelling of 28751885 in words is "twenty-eight million, seven hundred fifty-one thousand, eight hundred eighty-five".