28644736 has 32 divisors (see below), whose sum is σ = 58048200. Its totient is φ = 14075904.

The previous prime is 28644731. The next prime is 28644743. The reversal of 28644736 is 63744682.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28644731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5656 + ... + 9448.

Almost surely, 2^28644736 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 28644736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29024100).

28644736 is an abundant number, since it is smaller than the sum of its proper divisors (29403464).

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

28644736 is an equidigital number, since it uses as much as digits as its factorization.

28644736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866 (or 3854 counting only the distinct ones).

The product of its digits is 193536, while the sum is 40.

The square root of 28644736 is about 5352.0777273877. The cubic root of 28644736 is about 305.9719455391.

The spelling of 28644736 in words is "twenty-eight million, six hundred forty-four thousand, seven hundred thirty-six".