9997664 has 12 divisors (see below), whose sum is σ = 19682964. Its totient is φ = 4998816.

The previous prime is 9997661. The next prime is 9997697. The reversal of 9997664 is 4667999.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156182 + ... + 156245.

It is an arithmetic number, because the mean of its divisors is an integer number (1640247).

Almost surely, 2^9997664 is an apocalyptic number.

It is an amenable number.

9997664 is a deficient number, since it is larger than the sum of its proper divisors (9685300).

9997664 is a wasteful number, since it uses less digits than its factorization.

9997664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312437 (or 312429 counting only the distinct ones).

The product of its digits is 734832, while the sum is 50.

The square root of 9997664 is about 3161.9082845649. The cubic root of 9997664 is about 215.4266918320.

The spelling of 9997664 in words is "nine million, nine hundred ninety-seven thousand, six hundred sixty-four".