28686743 has 4 divisors (see below), whose sum is σ = 28699080. Its totient is φ = 28674408.

The previous prime is 28686733. The next prime is 28686767. The reversal of 28686743 is 34768682.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28686743 - 2¹⁰ = 28685719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28686694 and 28686703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686703) 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, 1505 + ... + 7722.

It is an arithmetic number, because the mean of its divisors is an integer number (7174770).

Almost surely, 2^28686743 is an apocalyptic number.

28686743 is a deficient number, since it is larger than the sum of its proper divisors (12337).

28686743 is an equidigital number, since it uses as much as digits as its factorization.

28686743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12336.

The product of its digits is 387072, while the sum is 44.

The square root of 28686743 is about 5356.0006534727. Note that the first 3 decimals coincide. The cubic root of 28686743 is about 306.1214399727.

The spelling of 28686743 in words is "twenty-eight million, six hundred eighty-six thousand, seven hundred forty-three".