28274181 has 16 divisors (see below), whose sum is σ = 40744704. Its totient is φ = 17337024.

The previous prime is 28274161. The next prime is 28274203. The reversal of 28274181 is 18147282.

It is a happy number.

It is not a de Polignac number, because 28274181 - 2¹⁵ = 28241413 is a prime.

It is a super-2 number, since 2×28274181² = 1598858622441522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28274131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11220 + ... + 13506.

It is an arithmetic number, because the mean of its divisors is an integer number (2546544).

Almost surely, 2^28274181 is an apocalyptic number.

It is an amenable number.

28274181 is a deficient number, since it is larger than the sum of its proper divisors (12470523).

28274181 is a wasteful number, since it uses less digits than its factorization.

28274181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620.

The product of its digits is 7168, while the sum is 33.

The square root of 28274181 is about 5317.3471769295. The cubic root of 28274181 is about 304.6468401811.

The spelling of 28274181 in words is "twenty-eight million, two hundred seventy-four thousand, one hundred eighty-one".