28680999 has 4 divisors (see below), whose sum is σ = 38241336. Its totient is φ = 19120664.

The previous prime is 28680979. The next prime is 28681001. The reversal of 28680999 is 99908682.

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

It is a cyclic number.

It is not a de Polignac number, because 28680999 - 2¹² = 28676903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680929) 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, 4780164 + ... + 4780169.

It is an arithmetic number, because the mean of its divisors is an integer number (9560334).

Almost surely, 2^28680999 is an apocalyptic number.

28680999 is a deficient number, since it is larger than the sum of its proper divisors (9560337).

28680999 is an equidigital number, since it uses as much as digits as its factorization.

28680999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9560336.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 28680999 is about 5355.4644056328. The cubic root of 28680999 is about 306.1010068534.

The spelling of 28680999 in words is "twenty-eight million, six hundred eighty thousand, nine hundred ninety-nine".