28683891 has 12 divisors (see below), whose sum is σ = 41750280. Its totient is φ = 18975840.

The previous prime is 28683883. The next prime is 28683923. The reversal of 28683891 is 19838682.

It is not a de Polignac number, because 28683891 - 2³ = 28683883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28683491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10986 + ... + 13343.

It is an arithmetic number, because the mean of its divisors is an integer number (3479190).

Almost surely, 2^28683891 is an apocalyptic number.

28683891 is a deficient number, since it is larger than the sum of its proper divisors (13066389).

28683891 is a wasteful number, since it uses less digits than its factorization.

28683891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24466 (or 24463 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 28683891 is about 5355.7344034222. The cubic root of 28683891 is about 306.1112949000. Note that the first 3 decimals are identical.

The spelling of 28683891 in words is "twenty-eight million, six hundred eighty-three thousand, eight hundred ninety-one".