28717453857 has 4 divisors (see below), whose sum is σ = 38289938480. Its totient is φ = 19144969236.

The previous prime is 28717453753. The next prime is 28717453859. The reversal of 28717453857 is 75835471782.

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 not a de Polignac number, because 28717453857 - 2¹¹ = 28717451809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28717453797 and 28717453806.

It is not an unprimeable number, because it can be changed into a prime (28717453859) 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 3 ways as a sum of consecutive naturals, for example, 4786242307 + ... + 4786242312.

It is an arithmetic number, because the mean of its divisors is an integer number (9572484620).

Almost surely, 2^28717453857 is an apocalyptic number.

It is an amenable number.

28717453857 is a deficient number, since it is larger than the sum of its proper divisors (9572484623).

28717453857 is an equidigital number, since it uses as much as digits as its factorization.

28717453857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9572484622.

The product of its digits is 13171200, while the sum is 57.

The spelling of 28717453857 in words is "twenty-eight billion, seven hundred seventeen million, four hundred fifty-three thousand, eight hundred fifty-seven".