8687144538 has 36 divisors (see below), whose sum is σ = 19545111690. Its totient is φ = 2895710472.

The previous prime is 8687144509. The next prime is 8687144573. The reversal of 8687144538 is 8354417868.

8687144538 is a `hidden beast` number, since 8 + 68 + 7 + 1 + 44 + 538 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5161991409 + 3525153129 = 71847^2 + 59373^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 317893 + ... + 344136.

Almost surely, 2^8687144538 is an apocalyptic number.

8687144538 is an abundant number, since it is smaller than the sum of its proper divisors (10857967152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8687144538 is an frugal number, since it uses more digits than its factorization.

8687144538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662055 (or 662034 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The square root of 8687144538 is about 93204.8525453477. The cubic root of 8687144538 is about 2055.6965915948.

The spelling of 8687144538 in words is "eight billion, six hundred eighty-seven million, one hundred forty-four thousand, five hundred thirty-eight".