28820736 has 108 divisors (see below), whose sum is σ = 95021472. Its totient is φ = 8229888.

The previous prime is 28820723. The next prime is 28820741. The reversal of 28820736 is 63702882.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28820736.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15235 + ... + 17021.

Almost surely, 2^28820736 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 28820736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47510736).

28820736 is an abundant number, since it is smaller than the sum of its proper divisors (66200736).

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

28820736 is a wasteful number, since it uses less digits than its factorization.

28820736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816 (or 1799 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28820736 is about 5368.4947611039. The cubic root of 28820736 is about 306.5973210142.

The spelling of 28820736 in words is "twenty-eight million, eight hundred twenty thousand, seven hundred thirty-six".