8668638 has 24 divisors (see below), whose sum is σ = 20489976. Its totient is φ = 2626800.

The previous prime is 8668637. The next prime is 8668643. The reversal of 8668638 is 8368668.

8668638 is a `hidden beast` number, since 8 + 6 + 6 + 8 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 8668593 and 8668602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8668637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21693 + ... + 22088.

It is an arithmetic number, because the mean of its divisors is an integer number (853749).

Almost surely, 2^8668638 is an apocalyptic number.

8668638 is an abundant number, since it is smaller than the sum of its proper divisors (11821338).

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

8668638 is a wasteful number, since it uses less digits than its factorization.

8668638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43800 (or 43797 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 8668638 is about 2944.2550840578. The cubic root of 8668638 is about 205.4235778845.

The spelling of 8668638 in words is "eight million, six hundred sixty-eight thousand, six hundred thirty-eight".