28180044 has 36 divisors (see below), whose sum is σ = 72215416. Its totient is φ = 9263808.

The previous prime is 28180039. The next prime is 28180063. The reversal of 28180044 is 44008182.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28180044² = 1588229759683872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2734 + ... + 7989.

Almost surely, 2^28180044 is an apocalyptic number.

It is an amenable number.

28180044 is an abundant number, since it is smaller than the sum of its proper divisors (44035372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28180044 is a wasteful number, since it uses less digits than its factorization.

28180044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806 (or 10801 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28180044 is about 5308.4879203027. The cubic root of 28180044 is about 304.3083638122.

The spelling of 28180044 in words is "twenty-eight million, one hundred eighty thousand, forty-four".