28872667 has 4 divisors (see below), whose sum is σ = 28919056. Its totient is φ = 28826280.

The previous prime is 28872643. The next prime is 28872689. The reversal of 28872667 is 76627882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76627882 = 2 ⋅38313941.

It is a cyclic number.

It is not a de Polignac number, because 28872667 - 2⁷ = 28872539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28872637) 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, 22248 + ... + 23509.

It is an arithmetic number, because the mean of its divisors is an integer number (7229764).

Almost surely, 2^28872667 is an apocalyptic number.

28872667 is a deficient number, since it is larger than the sum of its proper divisors (46389).

28872667 is an equidigital number, since it uses as much as digits as its factorization.

28872667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46388.

The product of its digits is 451584, while the sum is 46.

The square root of 28872667 is about 5373.3292286998. The cubic root of 28872667 is about 306.7813592476.

The spelling of 28872667 in words is "twenty-eight million, eight hundred seventy-two thousand, six hundred sixty-seven".