16638648 has 64 divisors (see below), whose sum is σ = 47446560. Its totient is φ = 4816896.

The previous prime is 16638647. The next prime is 16638653. The reversal of 16638648 is 84683661.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16638647) 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, 3736 + ... + 6872.

Almost surely, 2^16638648 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 16638648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23723280).

16638648 is an abundant number, since it is smaller than the sum of its proper divisors (30807912).

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

16638648 is a wasteful number, since it uses less digits than its factorization.

16638648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176 (or 3172 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 16638648 is about 4079.0498893737. The cubic root of 16638648 is about 255.2932573875.

The spelling of 16638648 in words is "sixteen million, six hundred thirty-eight thousand, six hundred forty-eight".