28667018 has 4 divisors (see below), whose sum is σ = 43000530. Its totient is φ = 14333508.

The previous prime is 28667017. The next prime is 28667057. The reversal of 28667018 is 81076682.

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

It can be written as a sum of positive squares in only one way, i.e., 20584369 + 8082649 = 4537^2 + 2843^2 .

It is not an unprimeable number, because it can be changed into a prime (28667017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7166753 + ... + 7166756.

Almost surely, 2^28667018 is an apocalyptic number.

28667018 is a deficient number, since it is larger than the sum of its proper divisors (14333512).

28667018 is a wasteful number, since it uses less digits than its factorization.

28667018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14333511.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28667018 is about 5354.1589442227. The cubic root of 28667018 is about 306.0512608671.

The spelling of 28667018 in words is "twenty-eight million, six hundred sixty-seven thousand, eighteen".