7668981 has 18 divisors (see below), whose sum is σ = 11311170. Its totient is φ = 5006880.

The previous prime is 7668977. The next prime is 7669001. The reversal of 7668981 is 1898667.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 18225 + 7650756 = 135^2 + 2766^2 .

It is not a de Polignac number, because 7668981 - 2² = 7668977 is a prime.

It is a super-2 number, since 2×7668981² = 117626539156722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7668901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33375 + ... + 33603.

Almost surely, 2^7668981 is an apocalyptic number.

It is an amenable number.

7668981 is a deficient number, since it is larger than the sum of its proper divisors (3642189).

7668981 is a wasteful number, since it uses less digits than its factorization.

7668981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 293 counting only the distinct ones).

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

The square root of 7668981 is about 2769.2925089271. The cubic root of 7668981 is about 197.2025624815.

It can be divided in two parts, 7668 and 981, that added together give a square (8649 = 93²).

The spelling of 7668981 in words is "seven million, six hundred sixty-eight thousand, nine hundred eighty-one".