28335681 has 24 divisors (see below), whose sum is σ = 44911776. Its totient is φ = 17072640.

The previous prime is 28335661. The next prime is 28335683. The reversal of 28335681 is 18653382.

It is not a de Polignac number, because 28335681 - 2⁵ = 28335649 is a prime.

It is a super-2 number, since 2×28335681² = 1605821635467522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28335683) 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 23 ways as a sum of consecutive naturals, for example, 18366 + ... + 19848.

It is an arithmetic number, because the mean of its divisors is an integer number (1871324).

Almost surely, 2^28335681 is an apocalyptic number.

It is an amenable number.

28335681 is a deficient number, since it is larger than the sum of its proper divisors (16576095).

28335681 is a wasteful number, since it uses less digits than its factorization.

28335681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693 (or 1690 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28335681 is about 5323.1269945400. The cubic root of 28335681 is about 304.8675623164.

The spelling of 28335681 in words is "twenty-eight million, three hundred thirty-five thousand, six hundred eighty-one".