28688267 has 8 divisors (see below), whose sum is σ = 29428080. Its totient is φ = 27951840.

The previous prime is 28688263. The next prime is 28688269. The reversal of 28688267 is 76288682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28688267 - 2² = 28688263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28688263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30017 + ... + 30957.

It is an arithmetic number, because the mean of its divisors is an integer number (3678510).

Almost surely, 2^28688267 is an apocalyptic number.

28688267 is a deficient number, since it is larger than the sum of its proper divisors (739813).

28688267 is an equidigital number, since it uses as much as digits as its factorization.

28688267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1693.

The product of its digits is 516096, while the sum is 47.

The square root of 28688267 is about 5356.1429219169. The cubic root of 28688267 is about 306.1268608369.

The spelling of 28688267 in words is "twenty-eight million, six hundred eighty-eight thousand, two hundred sixty-seven".