28857967 has 4 divisors (see below), whose sum is σ = 28874160. Its totient is φ = 28841776.

The previous prime is 28857949. The next prime is 28857971. The reversal of 28857967 is 76975882.

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 28857967 - 2²³ = 20469359 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 (28857937) 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, 5038 + ... + 9115.

It is an arithmetic number, because the mean of its divisors is an integer number (7218540).

Almost surely, 2^28857967 is an apocalyptic number.

28857967 is a deficient number, since it is larger than the sum of its proper divisors (16193).

28857967 is a wasteful number, since it uses less digits than its factorization.

28857967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16192.

The product of its digits is 1693440, while the sum is 52.

The square root of 28857967 is about 5371.9611874994. The cubic root of 28857967 is about 306.7292863356.

The spelling of 28857967 in words is "twenty-eight million, eight hundred fifty-seven thousand, nine hundred sixty-seven".