28968857 has 8 divisors (see below), whose sum is σ = 29511456. Its totient is φ = 28429632.

The previous prime is 28968847. The next prime is 28968871. The reversal of 28968857 is 75886982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28968857 - 2²⁰ = 27920281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28968799 and 28968808.

It is not an unprimeable number, because it can be changed into a prime (28968847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21938 + ... + 23220.

It is an arithmetic number, because the mean of its divisors is an integer number (3688932).

Almost surely, 2^28968857 is an apocalyptic number.

It is an amenable number.

28968857 is a deficient number, since it is larger than the sum of its proper divisors (542599).

28968857 is a wasteful number, since it uses less digits than its factorization.

28968857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687.

The product of its digits is 1935360, while the sum is 53.

The square root of 28968857 is about 5382.2724754512. The cubic root of 28968857 is about 307.1216648285.

The spelling of 28968857 in words is "twenty-eight million, nine hundred sixty-eight thousand, eight hundred fifty-seven".