28804440 has 128 divisors (see below), whose sum is σ = 100776960. Its totient is φ = 6449664.

The previous prime is 28804429. The next prime is 28804481. The reversal of 28804440 is 4440882.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28804398 and 28804407.

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 31 ways as a sum of consecutive naturals, for example, 44197 + ... + 44843.

It is an arithmetic number, because the mean of its divisors is an integer number (787320).

Almost surely, 2^28804440 is an apocalyptic number.

28804440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28804440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50388480).

28804440 is an abundant number, since it is smaller than the sum of its proper divisors (71972520).

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

28804440 is a wasteful number, since it uses less digits than its factorization.

28804440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 28804440 is about 5366.9768026329. The cubic root of 28804440 is about 306.5395240641.

The spelling of 28804440 in words is "twenty-eight million, eight hundred four thousand, four hundred forty".