28680851 has 4 divisors (see below), whose sum is σ = 28733832. Its totient is φ = 28627872.

The previous prime is 28680829. The next prime is 28680881. The reversal of 28680851 is 15808682.

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-28680851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28680811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25670 + ... + 26763.

It is an arithmetic number, because the mean of its divisors is an integer number (7183458).

Almost surely, 2^28680851 is an apocalyptic number.

28680851 is a deficient number, since it is larger than the sum of its proper divisors (52981).

28680851 is an equidigital number, since it uses as much as digits as its factorization.

28680851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52980.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28680851 is about 5355.4505879524. The cubic root of 28680851 is about 306.1004803373.

The spelling of 28680851 in words is "twenty-eight million, six hundred eighty thousand, eight hundred fifty-one".