28208736 has 60 divisors (see below), whose sum is σ = 82968732. Its totient is φ = 9402048.

The previous prime is 28208723. The next prime is 28208759. The reversal of 28208736 is 63780282.

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 28208736.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2850 + ... + 8033.

Almost surely, 2^28208736 is an apocalyptic number.

It is an amenable number.

28208736 is an abundant number, since it is smaller than the sum of its proper divisors (54759996).

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

28208736 is a wasteful number, since it uses less digits than its factorization.

28208736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10905 (or 10888 counting only the distinct ones).

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

The square root of 28208736 is about 5311.1896972336. The cubic root of 28208736 is about 304.4116077244.

The spelling of 28208736 in words is "twenty-eight million, two hundred eight thousand, seven hundred thirty-six".