16627644 has 72 divisors (see below), whose sum is σ = 46300800. Its totient is φ = 4989600.

The previous prime is 16627607. The next prime is 16627661. The reversal of 16627644 is 44672661.

16627644 is a `hidden beast` number, since 1 + 6 + 6 + 2 + 7 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16627599 and 16627608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78699 + ... + 78909.

Almost surely, 2^16627644 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 16627644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23150400).

16627644 is an abundant number, since it is smaller than the sum of its proper divisors (29673156).

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

16627644 is a wasteful number, since it uses less digits than its factorization.

16627644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 426 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 16627644 is about 4077.7008227677. The cubic root of 16627644 is about 255.2369654233.

It can be divided in two parts, 16627 and 644, that added together give a palindrome (17271).

The spelling of 16627644 in words is "sixteen million, six hundred twenty-seven thousand, six hundred forty-four".