28181028 has 24 divisors (see below), whose sum is σ = 69217120. Its totient is φ = 8899200.

The previous prime is 28181017. The next prime is 28181051. The reversal of 28181028 is 82018182.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28180986 and 28181004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61573 + ... + 62028.

Almost surely, 2^28181028 is an apocalyptic number.

It is an amenable number.

28181028 is an abundant number, since it is smaller than the sum of its proper divisors (41036092).

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

28181028 is a wasteful number, since it uses less digits than its factorization.

28181028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123627 (or 123625 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 28181028 is about 5308.5806012530. The cubic root of 28181028 is about 304.3119057507.

The spelling of 28181028 in words is "twenty-eight million, one hundred eighty-one thousand, twenty-eight".