28255507805503 has 16 divisors (see below), whose sum is σ = 30860979056640. Its totient is φ = 25656171141600.

The previous prime is 28255507805491. The next prime is 28255507805521. The reversal of 28255507805503 is 30550870555282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28255507805503 - 2²⁵ = 28255474251071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255507805563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210922578 + ... + 211056496.

It is an arithmetic number, because the mean of its divisors is an integer number (1928811191040).

Almost surely, 2^{28255507805503} is an apocalyptic number.

28255507805503 is a deficient number, since it is larger than the sum of its proper divisors (2605471251137).

28255507805503 is a wasteful number, since it uses less digits than its factorization.

28255507805503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156678.

The product of its (nonzero) digits is 16800000, while the sum is 55.

The spelling of 28255507805503 in words is "twenty-eight trillion, two hundred fifty-five billion, five hundred seven million, eight hundred five thousand, five hundred three".