28111217655 has 16 divisors (see below), whose sum is σ = 46074972384. Its totient is φ = 14626974720.

The previous prime is 28111217639. The next prime is 28111217669. The reversal of 28111217655 is 55671211182.

It is not a de Polignac number, because 28111217655 - 2⁴ = 28111217639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22854034 + ... + 22855263.

It is an arithmetic number, because the mean of its divisors is an integer number (2879685774).

Almost surely, 2^28111217655 is an apocalyptic number.

28111217655 is a deficient number, since it is larger than the sum of its proper divisors (17963754729).

28111217655 is a wasteful number, since it uses less digits than its factorization.

28111217655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45709346.

The product of its digits is 33600, while the sum is 39.

The spelling of 28111217655 in words is "twenty-eight billion, one hundred eleven million, two hundred seventeen thousand, six hundred fifty-five".