28167967 has 4 divisors (see below), whose sum is σ = 28823080. Its totient is φ = 27512856.

The previous prime is 28167947. The next prime is 28168009. The reversal of 28167967 is 76976182.

It is a happy number.

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-28167967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28167907) 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, 327492 + ... + 327577.

It is an arithmetic number, because the mean of its divisors is an integer number (7205770).

Almost surely, 2^28167967 is an apocalyptic number.

28167967 is a deficient number, since it is larger than the sum of its proper divisors (655113).

28167967 is an equidigital number, since it uses as much as digits as its factorization.

28167967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655112.

The product of its digits is 254016, while the sum is 46.

The square root of 28167967 is about 5307.3502805072. The cubic root of 28167967 is about 304.2648855592.

The spelling of 28167967 in words is "twenty-eight million, one hundred sixty-seven thousand, nine hundred sixty-seven".