28126558664 has 32 divisors (see below), whose sum is σ = 54497049600. Its totient is φ = 13594988160.

The previous prime is 28126558637. The next prime is 28126558673. The reversal of 28126558664 is 46685562182.

It is a super-2 number, since 2×28126558664² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 171857 + ... + 292895.

It is an arithmetic number, because the mean of its divisors is an integer number (1703032800).

Almost surely, 2^28126558664 is an apocalyptic number.

It is an amenable number.

28126558664 is a deficient number, since it is larger than the sum of its proper divisors (26370490936).

28126558664 is a wasteful number, since it uses less digits than its factorization.

28126558664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122013 (or 122009 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 53.

The spelling of 28126558664 in words is "twenty-eight billion, one hundred twenty-six million, five hundred fifty-eight thousand, six hundred sixty-four".