16645644 has 36 divisors (see below), whose sum is σ = 43059016. Its totient is φ = 5419008.

The previous prime is 16645639. The next prime is 16645649. The reversal of 16645644 is 44654661.

16645644 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 5 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (16645639) and next prime (16645649).

It is a tau number, because it is divible by the number of its divisors (36).

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 = 16645599 and 16645608.

It is not an unprimeable number, because it can be changed into a prime (16645649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3829 + ... + 6924.

Almost surely, 2^16645644 is an apocalyptic number.

It is an amenable number.

16645644 is an abundant number, since it is smaller than the sum of its proper divisors (26413372).

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

16645644 is a wasteful number, since it uses less digits than its factorization.

16645644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806 (or 10801 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 16645644 is about 4079.9073518893. The cubic root of 16645644 is about 255.3290331581.

The spelling of 16645644 in words is "sixteen million, six hundred forty-five thousand, six hundred forty-four".