28803636 has 72 divisors (see below), whose sum is σ = 77837760. Its totient is φ = 8959104.

The previous prime is 28803611. The next prime is 28803667. The reversal of 28803636 is 63630882.

It is a Harshad number since it is a multiple of its sum of digits (36).

28803636 is a modest number, since divided by 3636 gives 2880 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 28803636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35200 + ... + 36008.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^28803636 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 28803636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38918880).

28803636 is an abundant number, since it is smaller than the sum of its proper divisors (49034124).

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

28803636 is a wasteful number, since it uses less digits than its factorization.

28803636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 28803636 is about 5366.9018996065. The cubic root of 28803636 is about 306.5366719567.

The spelling of 28803636 in words is "twenty-eight million, eight hundred three thousand, six hundred thirty-six".