28346218687 has 4 divisors (see below), whose sum is σ = 28436782000. Its totient is φ = 28255655376.

The previous prime is 28346218669. The next prime is 28346218741. The reversal of 28346218687 is 78681264382.

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 28346218687 - 2³¹ = 26198735039 is a prime.

It is a super-3 number, since 3×28346218687³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28346218487) 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, 45281187 + ... + 45281812.

It is an arithmetic number, because the mean of its divisors is an integer number (7109195500).

Almost surely, 2^28346218687 is an apocalyptic number.

28346218687 is a deficient number, since it is larger than the sum of its proper divisors (90563313).

28346218687 is an equidigital number, since it uses as much as digits as its factorization.

28346218687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90563312.

The product of its digits is 6193152, while the sum is 55.

The spelling of 28346218687 in words is "twenty-eight billion, three hundred forty-six million, two hundred eighteen thousand, six hundred eighty-seven".