28243667 has 4 divisors (see below), whose sum is σ = 28255920. Its totient is φ = 28231416.

The previous prime is 28243661. The next prime is 28243669. The reversal of 28243667 is 76634282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 76634282 = 2 ⋅38317141.

It is a cyclic number.

It is not a de Polignac number, because 28243667 - 2⁶ = 28243603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28243667.

It is not an unprimeable number, because it can be changed into a prime (28243661) 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 3 ways as a sum of consecutive naturals, for example, 1508 + ... + 7665.

It is an arithmetic number, because the mean of its divisors is an integer number (7063980).

Almost surely, 2^28243667 is an apocalyptic number.

28243667 is a deficient number, since it is larger than the sum of its proper divisors (12253).

28243667 is an equidigital number, since it uses as much as digits as its factorization.

28243667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12252.

The product of its digits is 96768, while the sum is 38.

The square root of 28243667 is about 5314.4771144488. The cubic root of 28243667 is about 304.5372072994.

The spelling of 28243667 in words is "twenty-eight million, two hundred forty-three thousand, six hundred sixty-seven".