8668642 has 4 divisors (see below), whose sum is σ = 13002966. Its totient is φ = 4334320.

The previous prime is 8668637. The next prime is 8668643. The reversal of 8668642 is 2468668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4704561 + 3964081 = 2169^2 + 1991^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8668595 and 8668604.

It is not an unprimeable number, because it can be changed into a prime (8668643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2167159 + ... + 2167162.

Almost surely, 2^8668642 is an apocalyptic number.

8668642 is a deficient number, since it is larger than the sum of its proper divisors (4334324).

8668642 is a wasteful number, since it uses less digits than its factorization.

8668642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334323.

The product of its digits is 110592, while the sum is 40.

The square root of 8668642 is about 2944.2557633467. The cubic root of 8668642 is about 205.4236094810.

The spelling of 8668642 in words is "eight million, six hundred sixty-eight thousand, six hundred forty-two".