28181044 has 12 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 14011448.

The previous prime is 28181017. The next prime is 28181051. The reversal of 28181044 is 44018182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18964 + ... + 20395.

It is an arithmetic number, because the mean of its divisors is an integer number (4132800).

Almost surely, 2^28181044 is an apocalyptic number.

It is an amenable number.

28181044 is a deficient number, since it is larger than the sum of its proper divisors (21412556).

28181044 is a wasteful number, since it uses less digits than its factorization.

28181044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39542 (or 39540 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 28181044 is about 5308.5821082470. The cubic root of 28181044 is about 304.3119633425.

The spelling of 28181044 in words is "twenty-eight million, one hundred eighty-one thousand, forty-four".