28804356 has 72 divisors (see below), whose sum is σ = 86886240. Its totient is φ = 8228304.

The previous prime is 28804333. The next prime is 28804357. The reversal of 28804356 is 65340882.

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 28804356.

It is not an unprimeable number, because it can be changed into a prime (28804357) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2571 + ... + 8013.

Almost surely, 2^28804356 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 28804356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43443120).

28804356 is an abundant number, since it is smaller than the sum of its proper divisors (58081884).

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

28804356 is a wasteful number, since it uses less digits than its factorization.

28804356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470 (or 5455 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 28804356 is about 5366.9689769925. The cubic root of 28804356 is about 306.5392260852.

The spelling of 28804356 in words is "twenty-eight million, eight hundred four thousand, three hundred fifty-six".