28686699 has 6 divisors (see below), whose sum is σ = 41436356. Its totient is φ = 19124460.

The previous prime is 28686689. The next prime is 28686703. The reversal of 28686699 is 99668682.

It is not a de Polignac number, because 28686699 - 2⁷ = 28686571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28686629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1593697 + ... + 1593714.

Almost surely, 2^28686699 is an apocalyptic number.

28686699 is a deficient number, since it is larger than the sum of its proper divisors (12749657).

28686699 is a wasteful number, since it uses less digits than its factorization.

28686699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187417 (or 3187414 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 28686699 is about 5355.9965459287. The cubic root of 28686699 is about 306.1212834620.

The spelling of 28686699 in words is "twenty-eight million, six hundred eighty-six thousand, six hundred ninety-nine".