28427657218 has 16 divisors (see below), whose sum is σ = 44252842680. Its totient is φ = 13679842176.

The previous prime is 28427657191. The next prime is 28427657239. The reversal of 28427657218 is 81275672482.

It can be written as a sum of positive squares in 4 ways, for example, as 20373851169 + 8053806049 = 142737^2 + 89743^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764805 + ... + 801112.

Almost surely, 2^28427657218 is an apocalyptic number.

28427657218 is a deficient number, since it is larger than the sum of its proper divisors (15825185462).

28427657218 is a wasteful number, since it uses less digits than its factorization.

28427657218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566261.

The product of its digits is 3010560, while the sum is 52.

The spelling of 28427657218 in words is "twenty-eight billion, four hundred twenty-seven million, six hundred fifty-seven thousand, two hundred eighteen".