8638697138 has 16 divisors (see below), whose sum is σ = 13091769600. Its totient is φ = 4274824896.

The previous prime is 8638697129. The next prime is 8638697153. The reversal of 8638697138 is 8317968368.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354263 + ... + 377861.

It is an arithmetic number, because the mean of its divisors is an integer number (818235600).

Almost surely, 2^8638697138 is an apocalyptic number.

8638697138 is a deficient number, since it is larger than the sum of its proper divisors (4453072462).

8638697138 is a wasteful number, since it uses less digits than its factorization.

8638697138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25481.

The product of its digits is 10450944, while the sum is 59.

The square root of 8638697138 is about 92944.5917630499. The cubic root of 8638697138 is about 2051.8679890364.

The spelling of 8638697138 in words is "eight billion, six hundred thirty-eight million, six hundred ninety-seven thousand, one hundred thirty-eight".