28121737185 has 48 divisors (see below), whose sum is σ = 49848172608. Its totient is φ = 14661648000.

The previous prime is 28121737177. The next prime is 28121737211. The reversal of 28121737185 is 58173712182.

It is not a de Polignac number, because 28121737185 - 2³ = 28121737177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28121737185.

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 47 ways as a sum of consecutive naturals, for example, 416010 + ... + 478860.

It is an arithmetic number, because the mean of its divisors is an integer number (1038503596).

Almost surely, 2^28121737185 is an apocalyptic number.

It is an amenable number.

28121737185 is a deficient number, since it is larger than the sum of its proper divisors (21726435423).

28121737185 is a wasteful number, since it uses less digits than its factorization.

28121737185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63086 (or 63083 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The spelling of 28121737185 in words is "twenty-eight billion, one hundred twenty-one million, seven hundred thirty-seven thousand, one hundred eighty-five".