981668988 has 36 divisors (see below), whose sum is σ = 2482465440. Its totient is φ = 327087936.

The previous prime is 981668983. The next prime is 981668993. The reversal of 981668988 is 889866189.

It is an interprime number because it is at equal distance from previous prime (981668983) and next prime (981668993).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981668981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123181 + ... + 130907.

Almost surely, 2^981668988 is an apocalyptic number.

It is an amenable number.

981668988 is an abundant number, since it is smaller than the sum of its proper divisors (1500796452).

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

981668988 is a wasteful number, since it uses less digits than its factorization.

981668988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11266 (or 11261 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The square root of 981668988 is about 31331.5972781472. The cubic root of 981668988 is about 993.8519415061.

The spelling of 981668988 in words is "nine hundred eighty-one million, six hundred sixty-eight thousand, nine hundred eighty-eight".