997648 has 20 divisors (see below), whose sum is σ = 2017728. Its totient is φ = 476960.

The previous prime is 997637. The next prime is 997649. The reversal of 997648 is 846799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997649) by changing a digit.

997648 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988 + ... + 1723.

2⁹⁹⁷⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

997648 is an abundant number, since it is smaller than the sum of its proper divisors (1020080).

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

997648 is a wasteful number, since it uses less digits than its factorization.

997648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742 (or 2736 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 997648 is about 998.8233076976. The cubic root of 997648 is about 99.9215384540.

The spelling of 997648 in words is "nine hundred ninety-seven thousand, six hundred forty-eight".