28211117855 has 8 divisors (see below), whose sum is σ = 34163923200. Its totient is φ = 22361839776.

The previous prime is 28211117839. The next prime is 28211117873. The reversal of 28211117855 is 55871111282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28211117855 - 2⁴ = 28211117839 is a prime.

It is a congruent number.

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, 25881215 + ... + 25882304.

It is an arithmetic number, because the mean of its divisors is an integer number (4270490400).

Almost surely, 2^28211117855 is an apocalyptic number.

28211117855 is a deficient number, since it is larger than the sum of its proper divisors (5952805345).

28211117855 is a wasteful number, since it uses less digits than its factorization.

28211117855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51763633.

The product of its digits is 44800, while the sum is 41.

The spelling of 28211117855 in words is "twenty-eight billion, two hundred eleven million, one hundred seventeen thousand, eight hundred fifty-five".