28685714 has 4 divisors (see below), whose sum is σ = 43028574. Its totient is φ = 14342856.

The previous prime is 28685711. The next prime is 28685719. The reversal of 28685714 is 41758682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16540489 + 12145225 = 4067^2 + 3485^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28685711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7171427 + ... + 7171430.

Almost surely, 2^28685714 is an apocalyptic number.

28685714 is a deficient number, since it is larger than the sum of its proper divisors (14342860).

28685714 is a wasteful number, since it uses less digits than its factorization.

28685714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14342859.

The product of its digits is 107520, while the sum is 41.

The square root of 28685714 is about 5355.9045921301. The cubic root of 28685714 is about 306.1177797137.

The spelling of 28685714 in words is "twenty-eight million, six hundred eighty-five thousand, seven hundred fourteen".