28181533 has 8 divisors (see below), whose sum is σ = 29566080. Its totient is φ = 26824560.

The previous prime is 28181513. The next prime is 28181539. The reversal of 28181533 is 33518182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28181533 - 2⁵ = 28181501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28181495 and 28181504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28181539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4785 + ... + 8902.

It is an arithmetic number, because the mean of its divisors is an integer number (3695760).

Almost surely, 2^28181533 is an apocalyptic number.

It is an amenable number.

28181533 is a deficient number, since it is larger than the sum of its proper divisors (1384547).

28181533 is a wasteful number, since it uses less digits than its factorization.

28181533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13787.

The product of its digits is 5760, while the sum is 31.

The square root of 28181533 is about 5308.6281655433. The cubic root of 28181533 is about 304.3137234818.

The spelling of 28181533 in words is "twenty-eight million, one hundred eighty-one thousand, five hundred thirty-three".