9687666 has 16 divisors (see below), whose sum is σ = 19649088. Its totient is φ = 3183600.

The previous prime is 9687661. The next prime is 9687697. The reversal of 9687666 is 6667869.

9687666 = 24² + 25² + ... + 307².

It is a happy number.

9687666 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9687661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10945 + ... + 11796.

It is an arithmetic number, because the mean of its divisors is an integer number (1228068).

Almost surely, 2^9687666 is an apocalyptic number.

9687666 is an abundant number, since it is smaller than the sum of its proper divisors (9961422).

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

9687666 is a wasteful number, since it uses less digits than its factorization.

9687666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22817.

The product of its digits is 653184, while the sum is 48.

The square root of 9687666 is about 3112.5015662647. The cubic root of 9687666 is about 213.1766921967.

The spelling of 9687666 in words is "nine million, six hundred eighty-seven thousand, six hundred sixty-six".