28081814653 has 4 divisors (see below), whose sum is σ = 28087563420. Its totient is φ = 28076065888.

The previous prime is 28081814591. The next prime is 28081814723. The reversal of 28081814653 is 35641818082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13210743844 + 14871070809 = 114938^2 + 121947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28081814653 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 (28081814053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2867050 + ... + 2876827.

It is an arithmetic number, because the mean of its divisors is an integer number (7021890855).

Almost surely, 2^28081814653 is an apocalyptic number.

It is an amenable number.

28081814653 is a deficient number, since it is larger than the sum of its proper divisors (5748767).

28081814653 is an equidigital number, since it uses as much as digits as its factorization.

28081814653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748766.

The product of its (nonzero) digits is 368640, while the sum is 46.

The spelling of 28081814653 in words is "twenty-eight billion, eighty-one million, eight hundred fourteen thousand, six hundred fifty-three".