28807844 has 24 divisors (see below), whose sum is σ = 55042680. Its totient is φ = 13112064.

The previous prime is 28807841. The next prime is 28807853. The reversal of 28807844 is 44870882.

It can be written as a sum of positive squares in 4 ways, for example, as 313600 + 28494244 = 560^2 + 5338^2 .

It is not an unprimeable number, because it can be changed into a prime (28807841) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2 + ... + 7590.

It is an arithmetic number, because the mean of its divisors is an integer number (2293445).

Almost surely, 2^28807844 is an apocalyptic number.

It is an amenable number.

28807844 is a deficient number, since it is larger than the sum of its proper divisors (26234836).

28807844 is a wasteful number, since it uses less digits than its factorization.

28807844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7679 (or 7677 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 28807844 is about 5367.2939177951. The cubic root of 28807844 is about 306.5515988165.

The spelling of 28807844 in words is "twenty-eight million, eight hundred seven thousand, eight hundred forty-four".