28066624 has 42 divisors (see below), whose sum is σ = 58291730. Its totient is φ = 13406976.

The previous prime is 28066613. The next prime is 28066651. The reversal of 28066624 is 42666082.

It can be written as a sum of positive squares in only one way, i.e., 24681024 + 3385600 = 4968^2 + 1840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28066624.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33442 + ... + 34270.

Almost surely, 2^28066624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28066624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29145865).

28066624 is an abundant number, since it is smaller than the sum of its proper divisors (30225106).

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

28066624 is an equidigital number, since it uses as much as digits as its factorization.

28066624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28066624 is about 5297.7942579908. The cubic root of 28066624 is about 303.8995513006.

The spelling of 28066624 in words is "twenty-eight million, sixty-six thousand, six hundred twenty-four".