28341865687 has 4 divisors (see below), whose sum is σ = 28342221336. Its totient is φ = 28341510040.

The previous prime is 28341865553. The next prime is 28341865691. The reversal of 28341865687 is 78656814382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78656814382 = 2 ⋅39328407191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28341865687 is a prime.

It is a super-2 number, since 2×28341865687² (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 (28341862687) by changing a digit.

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, 3012 + ... + 238102.

It is an arithmetic number, because the mean of its divisors is an integer number (7085555334).

Almost surely, 2^28341865687 is an apocalyptic number.

28341865687 is a deficient number, since it is larger than the sum of its proper divisors (355649).

28341865687 is a wasteful number, since it uses less digits than its factorization.

28341865687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355648.

The product of its digits is 15482880, while the sum is 58.

The spelling of 28341865687 in words is "twenty-eight billion, three hundred forty-one million, eight hundred sixty-five thousand, six hundred eighty-seven".