28155486511 has 4 divisors (see below), whose sum is σ = 28178509392. Its totient is φ = 28132463632.

The previous prime is 28155486487. The next prime is 28155486517. The reversal of 28155486511 is 11568455182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28155486511 - 2¹⁵ = 28155453743 is a prime.

It is a super-2 number, since 2×28155486511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155486517) by changing a digit.

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, 11509606 + ... + 11512051.

It is an arithmetic number, because the mean of its divisors is an integer number (7044627348).

Almost surely, 2^28155486511 is an apocalyptic number.

28155486511 is a deficient number, since it is larger than the sum of its proper divisors (23022881).

28155486511 is a wasteful number, since it uses less digits than its factorization.

28155486511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23022880.

The product of its digits is 384000, while the sum is 46.

The spelling of 28155486511 in words is "twenty-eight billion, one hundred fifty-five million, four hundred eighty-six thousand, five hundred eleven".