28686937 has 4 divisors (see below), whose sum is σ = 28724176. Its totient is φ = 28649700.

The previous prime is 28686919. The next prime is 28686961. The reversal of 28686937 is 73968682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28686937 - 2⁷ = 28686809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28686907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17439 + ... + 19012.

It is an arithmetic number, because the mean of its divisors is an integer number (7181044).

Almost surely, 2^28686937 is an apocalyptic number.

It is an amenable number.

28686937 is a deficient number, since it is larger than the sum of its proper divisors (37239).

28686937 is an equidigital number, since it uses as much as digits as its factorization.

28686937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37238.

The product of its digits is 870912, while the sum is 49.

The square root of 28686937 is about 5356.0187639701. The cubic root of 28686937 is about 306.1221300409.

The spelling of 28686937 in words is "twenty-eight million, six hundred eighty-six thousand, nine hundred thirty-seven".