28791184 has 20 divisors (see below), whose sum is σ = 57144780. Its totient is φ = 14044160.

The previous prime is 28791167. The next prime is 28791187. The reversal of 28791184 is 48119782.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14137600 + 14653584 = 3760^2 + 3828^2 .

It is a super-2 number, since 2×28791184² = 1657864552243712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28791187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21289 + ... + 22600.

It is an arithmetic number, because the mean of its divisors is an integer number (2857239).

Almost surely, 2^28791184 is an apocalyptic number.

It is an amenable number.

28791184 is a deficient number, since it is larger than the sum of its proper divisors (28353596).

28791184 is a wasteful number, since it uses less digits than its factorization.

28791184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43938 (or 43932 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 28791184 is about 5365.7417008276. The cubic root of 28791184 is about 306.4924929879.

The spelling of 28791184 in words is "twenty-eight million, seven hundred ninety-one thousand, one hundred eighty-four".