28751860 has 24 divisors (see below), whose sum is σ = 60487560. Its totient is φ = 11480064.

The previous prime is 28751857. The next prime is 28751873. The reversal of 28751860 is 6815782.

It can be written as a sum of positive squares in 4 ways, for example, as 7628644 + 21123216 = 2762^2 + 4596^2 .

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 7 ways as a sum of consecutive naturals, for example, 15292 + ... + 17068.

It is an arithmetic number, because the mean of its divisors is an integer number (2520315).

Almost surely, 2^28751860 is an apocalyptic number.

28751860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28751860 is an abundant number, since it is smaller than the sum of its proper divisors (31735700).

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

28751860 is a wasteful number, since it uses less digits than its factorization.

28751860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595 (or 2593 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 28751860 is about 5362.0760904709. The cubic root of 28751860 is about 306.3528900432.

The spelling of 28751860 in words is "twenty-eight million, seven hundred fifty-one thousand, eight hundred sixty".