28767887 has 4 divisors (see below), whose sum is σ = 28787256. Its totient is φ = 28748520.

The previous prime is 28767839. The next prime is 28767911. The reversal of 28767887 is 78876782.

It is a happy number.

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 28767887 - 2⁸ = 28767631 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 (28767787) 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, 7253 + ... + 10494.

It is an arithmetic number, because the mean of its divisors is an integer number (7196814).

Almost surely, 2^28767887 is an apocalyptic number.

28767887 is a deficient number, since it is larger than the sum of its proper divisors (19369).

28767887 is a wasteful number, since it uses less digits than its factorization.

28767887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19368.

The product of its digits is 2107392, while the sum is 53.

The square root of 28767887 is about 5363.5703593782. The cubic root of 28767887 is about 306.4098023699.

The spelling of 28767887 in words is "twenty-eight million, seven hundred sixty-seven thousand, eight hundred eighty-seven".