28180084 has 12 divisors (see below), whose sum is σ = 52216164. Its totient is φ = 13261184.

The previous prime is 28180063. The next prime is 28180091. The reversal of 28180084 is 48008182.

It can be written as a sum of positive squares in 2 ways, for example, as 10304100 + 17875984 = 3210^2 + 4228^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207139 + ... + 207274.

It is an arithmetic number, because the mean of its divisors is an integer number (4351347).

Almost surely, 2^28180084 is an apocalyptic number.

It is an amenable number.

28180084 is a deficient number, since it is larger than the sum of its proper divisors (24036080).

28180084 is a wasteful number, since it uses less digits than its factorization.

28180084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414434 (or 414432 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 28180084 is about 5308.4916878526. The cubic root of 28180084 is about 304.3085077950.

The spelling of 28180084 in words is "twenty-eight million, one hundred eighty thousand, eighty-four".