9997644 has 24 divisors (see below), whose sum is σ = 23431408. Its totient is φ = 3317760.

The previous prime is 9997643. The next prime is 9997661. The reversal of 9997644 is 4467999.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9997593 and 9997602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997643) 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, 1164 + ... + 4620.

Almost surely, 2^9997644 is an apocalyptic number.

It is an amenable number.

9997644 is an abundant number, since it is smaller than the sum of its proper divisors (13433764).

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

9997644 is a wasteful number, since it uses less digits than its factorization.

9997644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705 (or 3703 counting only the distinct ones).

The product of its digits is 489888, while the sum is 48.

The square root of 9997644 is about 3161.9051219162. The cubic root of 9997644 is about 215.4265481805.

The spelling of 9997644 in words is "nine million, nine hundred ninety-seven thousand, six hundred forty-four".