28768871 has 4 divisors (see below), whose sum is σ = 28797600. Its totient is φ = 28740144.

The previous prime is 28768843. The next prime is 28768889. The reversal of 28768871 is 17886782.

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 28768871 - 2²² = 24574567 is a prime.

It is a super-2 number, since 2×28768871² = 1655295877229282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28768801) 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, 12806 + ... + 14883.

It is an arithmetic number, because the mean of its divisors is an integer number (7199400).

Almost surely, 2^28768871 is an apocalyptic number.

28768871 is a deficient number, since it is larger than the sum of its proper divisors (28729).

28768871 is a wasteful number, since it uses less digits than its factorization.

28768871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28728.

The product of its digits is 301056, while the sum is 47.

The square root of 28768871 is about 5363.6620885362. The cubic root of 28768871 is about 306.4132958927.

The spelling of 28768871 in words is "twenty-eight million, seven hundred sixty-eight thousand, eight hundred seventy-one".