28126431664 has 20 divisors (see below), whose sum is σ = 54753237880. Its totient is φ = 13996563840.

The previous prime is 28126431649. The next prime is 28126431701. The reversal of 28126431664 is 46613462182.

It is a self number, because there is not a number n which added to its sum of digits gives 28126431664.

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 3 ways as a sum of consecutive naturals, for example, 4162269 + ... + 4169020.

It is an arithmetic number, because the mean of its divisors is an integer number (2737661894).

Almost surely, 2^28126431664 is an apocalyptic number.

It is an amenable number.

28126431664 is a deficient number, since it is larger than the sum of its proper divisors (26626806216).

28126431664 is a wasteful number, since it uses less digits than its factorization.

28126431664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331508 (or 8331502 counting only the distinct ones).

The product of its digits is 331776, while the sum is 43.

The spelling of 28126431664 in words is "twenty-eight billion, one hundred twenty-six million, four hundred thirty-one thousand, six hundred sixty-four".