28389240655 has 4 divisors (see below), whose sum is σ = 34067088792. Its totient is φ = 22711392520.

The previous prime is 28389240629. The next prime is 28389240707. The reversal of 28389240655 is 55604298382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55604298382 = 2 ⋅27802149191.

It is not a de Polignac number, because 28389240655 - 2²⁷ = 28255022927 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2838924061 + ... + 2838924070.

It is an arithmetic number, because the mean of its divisors is an integer number (8516772198).

Almost surely, 2^28389240655 is an apocalyptic number.

28389240655 is a deficient number, since it is larger than the sum of its proper divisors (5677848137).

28389240655 is an equidigital number, since it uses as much as digits as its factorization.

28389240655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5677848136.

The product of its (nonzero) digits is 4147200, while the sum is 52.

The spelling of 28389240655 in words is "twenty-eight billion, three hundred eighty-nine million, two hundred forty thousand, six hundred fifty-five".