1663648 has 36 divisors (see below), whose sum is σ = 3813642. Its totient is φ = 712320.

The previous prime is 1663619. The next prime is 1663681. The reversal of 1663648 is 8463661.

It can be written as a sum of positive squares in only one way, i.e., 1317904 + 345744 = 1148^2 + 588^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1038 + ... + 2098.

2^1663648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906821).

1663648 is an abundant number, since it is smaller than the sum of its proper divisors (2149994).

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

1663648 is a wasteful number, since it uses less digits than its factorization.

1663648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1070 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 1663648 is about 1289.8247943035. The cubic root of 1663648 is about 118.4914863889.

The spelling of 1663648 in words is "one million, six hundred sixty-three thousand, six hundred forty-eight".