28545273857 has 4 divisors (see below), whose sum is σ = 28546052100. Its totient is φ = 28544495616.

The previous prime is 28545273853. The next prime is 28545273863. The reversal of 28545273857 is 75837254582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26011560961 + 2533712896 = 161281^2 + 50336^2 .

It is a cyclic number.

It is not a de Polignac number, because 28545273857 - 2² = 28545273853 is a prime.

It is a super-2 number, since 2×28545273857² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28545273853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331232 + ... + 408417.

It is an arithmetic number, because the mean of its divisors is an integer number (7136513025).

Almost surely, 2^28545273857 is an apocalyptic number.

It is an amenable number.

28545273857 is a deficient number, since it is larger than the sum of its proper divisors (778243).

28545273857 is an equidigital number, since it uses as much as digits as its factorization.

28545273857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778242.

The product of its digits is 18816000, while the sum is 56.

The spelling of 28545273857 in words is "twenty-eight billion, five hundred forty-five million, two hundred seventy-three thousand, eight hundred fifty-seven".