28812667 has 4 divisors (see below), whose sum is σ = 31029040. Its totient is φ = 26596296.

The previous prime is 28812659. The next prime is 28812673. The reversal of 28812667 is 76621882.

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

It is a cyclic number.

It is not a de Polignac number, because 28812667 - 2³ = 28812659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28812647) 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, 1108167 + ... + 1108192.

It is an arithmetic number, because the mean of its divisors is an integer number (7757260).

Almost surely, 2^28812667 is an apocalyptic number.

28812667 is a deficient number, since it is larger than the sum of its proper divisors (2216373).

28812667 is a wasteful number, since it uses less digits than its factorization.

28812667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216372.

The product of its digits is 64512, while the sum is 40.

The square root of 28812667 is about 5367.7431943043. The cubic root of 28812667 is about 306.5687054520.

The spelling of 28812667 in words is "twenty-eight million, eight hundred twelve thousand, six hundred sixty-seven".