8639387642 has 16 divisors (see below), whose sum is σ = 13209446952. Its totient is φ = 4236311040.

The previous prime is 8639387629. The next prime is 8639387657. The reversal of 8639387642 is 2467839368.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7949327281 + 690060361 = 89159^2 + 26269^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239342 + ... + 273062.

Almost surely, 2^8639387642 is an apocalyptic number.

8639387642 is a deficient number, since it is larger than the sum of its proper divisors (4570059310).

8639387642 is a wasteful number, since it uses less digits than its factorization.

8639387642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36193.

The product of its digits is 10450944, while the sum is 56.

The square root of 8639387642 is about 92948.3062890336. The cubic root of 8639387642 is about 2051.9226572070.

The spelling of 8639387642 in words is "eight billion, six hundred thirty-nine million, three hundred eighty-seven thousand, six hundred forty-two".