28657199 has 4 divisors (see below), whose sum is σ = 28979280. Its totient is φ = 28335120.

The previous prime is 28657163. The next prime is 28657201. The reversal of 28657199 is 99175682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28657199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28650199) 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, 160907 + ... + 161084.

It is an arithmetic number, because the mean of its divisors is an integer number (7244820).

Almost surely, 2^28657199 is an apocalyptic number.

28657199 is a deficient number, since it is larger than the sum of its proper divisors (322081).

28657199 is an equidigital number, since it uses as much as digits as its factorization.

28657199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322080.

The product of its digits is 272160, while the sum is 47.

The square root of 28657199 is about 5353.2419149521. The cubic root of 28657199 is about 306.0163140803.

The spelling of 28657199 in words is "twenty-eight million, six hundred fifty-seven thousand, one hundred ninety-nine".