28318081 has 8 divisors (see below), whose sum is σ = 30931200. Its totient is φ = 25711440.

The previous prime is 28318067. The next prime is 28318093. The reversal of 28318081 is 18081382.

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 28318081 - 2¹⁷ = 28187009 is a prime.

It is a super-2 number, since 2×28318081² = 1603827423045122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28318021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14935 + ... + 16723.

It is an arithmetic number, because the mean of its divisors is an integer number (3866400).

Almost surely, 2^28318081 is an apocalyptic number.

It is an amenable number.

28318081 is a deficient number, since it is larger than the sum of its proper divisors (2613119).

28318081 is a wasteful number, since it uses less digits than its factorization.

28318081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 28318081 is about 5321.4735741146. The cubic root of 28318081 is about 304.8044289547.

The spelling of 28318081 in words is "twenty-eight million, three hundred eighteen thousand, eighty-one".