28809944 has 8 divisors (see below), whose sum is σ = 54018660. Its totient is φ = 14404968.

The previous prime is 28809941. The next prime is 28809953. The reversal of 28809944 is 44990882.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 28809895 and 28809904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28809941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1800614 + ... + 1800629.

Almost surely, 2^28809944 is an apocalyptic number.

It is an amenable number.

28809944 is a deficient number, since it is larger than the sum of its proper divisors (25208716).

28809944 is a wasteful number, since it uses less digits than its factorization.

28809944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601249 (or 3601245 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28809944 is about 5367.4895435390. The cubic root of 28809944 is about 306.5590475136.

The spelling of 28809944 in words is "twenty-eight million, eight hundred nine thousand, nine hundred forty-four".