28387844 has 6 divisors (see below), whose sum is σ = 49678734. Its totient is φ = 14193920.

The previous prime is 28387787. The next prime is 28387861. The reversal of 28387844 is 44878382.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 1658944 = 5170^2 + 1288^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28387795 and 28387804.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3548477 + ... + 3548484.

It is an arithmetic number, because the mean of its divisors is an integer number (8279789).

Almost surely, 2^28387844 is an apocalyptic number.

It is an amenable number.

28387844 is a deficient number, since it is larger than the sum of its proper divisors (21290890).

28387844 is a wasteful number, since it uses less digits than its factorization.

28387844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7096965 (or 7096963 counting only the distinct ones).

The product of its digits is 344064, while the sum is 44.

The square root of 28387844 is about 5328.0243993435. The cubic root of 28387844 is about 305.0545239798.

The spelling of 28387844 in words is "twenty-eight million, three hundred eighty-seven thousand, eight hundred forty-four".