28687893 has 16 divisors (see below), whose sum is σ = 41973120. Its totient is φ = 17319744.

The previous prime is 28687889. The next prime is 28687909. The reversal of 28687893 is 39878682.

It is not a de Polignac number, because 28687893 - 2² = 28687889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687843) 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, 4873 + ... + 9006.

It is an arithmetic number, because the mean of its divisors is an integer number (2623320).

Almost surely, 2^28687893 is an apocalyptic number.

It is an amenable number.

28687893 is a deficient number, since it is larger than the sum of its proper divisors (13285227).

28687893 is a wasteful number, since it uses less digits than its factorization.

28687893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13948.

The product of its digits is 1161216, while the sum is 51.

The square root of 28687893 is about 5356.1080086197. The cubic root of 28687893 is about 306.1255305376.

The spelling of 28687893 in words is "twenty-eight million, six hundred eighty-seven thousand, eight hundred ninety-three".