9639660 has 48 divisors (see below), whose sum is σ = 27127296. Its totient is φ = 2557632.

The previous prime is 9639649. The next prime is 9639661. The reversal of 9639660 is 669369.

9639660 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 a super-3 number, since 3×9639660³ (a number of 22 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9639661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20589 + ... + 21051.

It is an arithmetic number, because the mean of its divisors is an integer number (565152).

Almost surely, 2^9639660 is an apocalyptic number.

It is an amenable number.

9639660 is an abundant number, since it is smaller than the sum of its proper divisors (17487636).

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

9639660 is a wasteful number, since it uses less digits than its factorization.

9639660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 9639660 is about 3104.7801854560. The cubic root of 9639660 is about 212.8239856036.

The spelling of 9639660 in words is "nine million, six hundred thirty-nine thousand, six hundred sixty".