28668750 has 96 divisors (see below), whose sum is σ = 78744960. Its totient is φ = 6900000.

The previous prime is 28668743. The next prime is 28668751. The reversal of 28668750 is 5786682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28668751) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206181 + ... + 206319.

It is an arithmetic number, because the mean of its divisors is an integer number (820260).

Almost surely, 2^28668750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28668750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39372480).

28668750 is an abundant number, since it is smaller than the sum of its proper divisors (50076210).

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

28668750 is a wasteful number, since it uses less digits than its factorization.

28668750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 28668750 is about 5354.3206852037. The cubic root of 28668750 is about 306.0574243975.

The spelling of 28668750 in words is "twenty-eight million, six hundred sixty-eight thousand, seven hundred fifty".