28863257 has 4 divisors (see below), whose sum is σ = 28887936. Its totient is φ = 28838580.

The previous prime is 28863239. The next prime is 28863269. The reversal of 28863257 is 75236882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28863257 - 2¹⁶ = 28797721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28863287) 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 3 ways as a sum of consecutive naturals, for example, 10493 + ... + 12954.

It is an arithmetic number, because the mean of its divisors is an integer number (7221984).

Almost surely, 2^28863257 is an apocalyptic number.

It is an amenable number.

28863257 is a deficient number, since it is larger than the sum of its proper divisors (24679).

28863257 is a wasteful number, since it uses less digits than its factorization.

28863257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24678.

The product of its digits is 161280, while the sum is 41.

The square root of 28863257 is about 5372.4535363277. The cubic root of 28863257 is about 306.7480275356.

The spelling of 28863257 in words is "twenty-eight million, eight hundred sixty-three thousand, two hundred fifty-seven".