28509422057 has 4 divisors (see below), whose sum is σ = 28512986196. Its totient is φ = 28505857920.

The previous prime is 28509422041. The next prime is 28509422099. The reversal of 28509422057 is 75022490582.

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 16301160976 + 12208261081 = 127676^2 + 110491^2 .

It is a cyclic number.

It is not a de Polignac number, because 28509422057 - 2⁴ = 28509422041 is a prime.

It is a super-2 number, since 2×28509422057² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28509421999 and 28509422017.

It is not an unprimeable number, because it can be changed into a prime (28509422257) 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, 1770044 + ... + 1786077.

It is an arithmetic number, because the mean of its divisors is an integer number (7128246549).

Almost surely, 2^28509422057 is an apocalyptic number.

It is an amenable number.

28509422057 is a deficient number, since it is larger than the sum of its proper divisors (3564139).

28509422057 is an equidigital number, since it uses as much as digits as its factorization.

28509422057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564138.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 28509422057 in words is "twenty-eight billion, five hundred nine million, four hundred twenty-two thousand, fifty-seven".