28239667 has 4 divisors (see below), whose sum is σ = 29150656. Its totient is φ = 27328680.

The previous prime is 28239641. The next prime is 28239683. The reversal of 28239667 is 76693282.

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-28239667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28239697) 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, 455448 + ... + 455509.

It is an arithmetic number, because the mean of its divisors is an integer number (7287664).

Almost surely, 2^28239667 is an apocalyptic number.

28239667 is a deficient number, since it is larger than the sum of its proper divisors (910989).

28239667 is an equidigital number, since it uses as much as digits as its factorization.

28239667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910988.

The product of its digits is 217728, while the sum is 43.

The square root of 28239667 is about 5314.1007705914. The cubic root of 28239667 is about 304.5228299602.

The spelling of 28239667 in words is "twenty-eight million, two hundred thirty-nine thousand, six hundred sixty-seven".