28857108257 has 4 divisors (see below), whose sum is σ = 28860308400. Its totient is φ = 28853908116.

The previous prime is 28857108223. The next prime is 28857108281. The reversal of 28857108257 is 75280175882.

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 28857108257 - 2⁶ = 28857108193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28857108199 and 28857108208.

It is not an unprimeable number, because it can be changed into a prime (28857108757) 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, 1586507 + ... + 1604592.

It is an arithmetic number, because the mean of its divisors is an integer number (7215077100).

Almost surely, 2^28857108257 is an apocalyptic number.

It is an amenable number.

28857108257 is a deficient number, since it is larger than the sum of its proper divisors (3200143).

28857108257 is an equidigital number, since it uses as much as digits as its factorization.

28857108257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200142.

The product of its (nonzero) digits is 2508800, while the sum is 53.

The spelling of 28857108257 in words is "twenty-eight billion, eight hundred fifty-seven million, one hundred eight thousand, two hundred fifty-seven".