638863786287 has 24 divisors (see below), whose sum is σ = 941761136160. Its totient is φ = 417235815360.

The previous prime is 638863786283. The next prime is 638863786321. The reversal of 638863786287 is 782687368836.

It is not a de Polignac number, because 638863786287 - 2² = 638863786283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638863786283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3083712 + ... + 3284357.

It is an arithmetic number, because the mean of its divisors is an integer number (39240047340).

Almost surely, 2^638863786287 is an apocalyptic number.

638863786287 is a deficient number, since it is larger than the sum of its proper divisors (302897349873).

638863786287 is a wasteful number, since it uses less digits than its factorization.

638863786287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6368303 (or 6368300 counting only the distinct ones).

The product of its digits is 780337152, while the sum is 72.

The spelling of 638863786287 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, seven hundred eighty-six thousand, two hundred eighty-seven".