18828636687 has 48 divisors (see below), whose sum is σ = 32159395840. Its totient is φ = 10387958400.

The previous prime is 18828636683. The next prime is 18828636691. The reversal of 18828636687 is 78663682881.

It is an interprime number because it is at equal distance from previous prime (18828636683) and next prime (18828636691).

It is not a de Polignac number, because 18828636687 - 2² = 18828636683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18828636683) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 846387 + ... + 868347.

Almost surely, 2^18828636687 is an apocalyptic number.

18828636687 is a deficient number, since it is larger than the sum of its proper divisors (13330759153).

18828636687 is a wasteful number, since it uses less digits than its factorization.

18828636687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22444 (or 22441 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 18828636687 in words is "eighteen billion, eight hundred twenty-eight million, six hundred thirty-six thousand, six hundred eighty-seven".