9871668 has 18 divisors (see below), whose sum is σ = 24953474. Its totient is φ = 3290544.

The previous prime is 9871663. The next prime is 9871699. The reversal of 9871668 is 8661789.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6906384 + 2965284 = 2628^2 + 1722^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9871661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 137071 + ... + 137142.

Almost surely, 2^9871668 is an apocalyptic number.

It is an amenable number.

9871668 is an abundant number, since it is smaller than the sum of its proper divisors (15081806).

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

9871668 is a wasteful number, since it uses less digits than its factorization.

9871668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274223 (or 274218 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 9871668 is about 3141.9210683911. The cubic root of 9871668 is about 214.5178885435.

The spelling of 9871668 in words is "nine million, eight hundred seventy-one thousand, six hundred sixty-eight".