28263215687 has 4 divisors (see below), whose sum is σ = 32300817936. Its totient is φ = 24225613440.

The previous prime is 28263215681. The next prime is 28263215699. The reversal of 28263215687 is 78651236282.

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

It is not a de Polignac number, because 28263215687 - 2⁴ = 28263215671 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 (28263215681) 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, 2018801114 + ... + 2018801127.

It is an arithmetic number, because the mean of its divisors is an integer number (8075204484).

Almost surely, 2^28263215687 is an apocalyptic number.

28263215687 is a deficient number, since it is larger than the sum of its proper divisors (4037602249).

28263215687 is an equidigital number, since it uses as much as digits as its factorization.

28263215687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037602248.

The product of its digits is 1935360, while the sum is 50.

The spelling of 28263215687 in words is "twenty-eight billion, two hundred sixty-three million, two hundred fifteen thousand, six hundred eighty-seven".