28135077668 has 12 divisors (see below), whose sum is σ = 50934192540. Its totient is φ = 13582451232.

The previous prime is 28135077653. The next prime is 28135077671. The reversal of 28135077668 is 86677053182.

It can be written as a sum of positive squares in 2 ways, for example, as 10687837924 + 17447239744 = 103382^2 + 132088^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121271771 + ... + 121272002.

It is an arithmetic number, because the mean of its divisors is an integer number (4244516045).

Almost surely, 2^28135077668 is an apocalyptic number.

It is an amenable number.

28135077668 is a deficient number, since it is larger than the sum of its proper divisors (22799114872).

28135077668 is a wasteful number, since it uses less digits than its factorization.

28135077668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242543806 (or 242543804 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 28135077668 in words is "twenty-eight billion, one hundred thirty-five million, seventy-seven thousand, six hundred sixty-eight".