28812863 has 8 divisors (see below), whose sum is σ = 29879280. Its totient is φ = 27751360.

The previous prime is 28812821. The next prime is 28812877. The reversal of 28812863 is 36821882.

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 28812863 - 2⁶ = 28812799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28812163) 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 7 ways as a sum of consecutive naturals, for example, 14156 + ... + 16062.

It is an arithmetic number, because the mean of its divisors is an integer number (3734910).

Almost surely, 2^28812863 is an apocalyptic number.

28812863 is a deficient number, since it is larger than the sum of its proper divisors (1066417).

28812863 is a wasteful number, since it uses less digits than its factorization.

28812863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457.

The product of its digits is 36864, while the sum is 38.

The square root of 28812863 is about 5367.7614514805. The cubic root of 28812863 is about 306.5694006014.

The spelling of 28812863 in words is "twenty-eight million, eight hundred twelve thousand, eight hundred sixty-three".