16644402 has 24 divisors (see below), whose sum is σ = 36189036. Its totient is φ = 5528736.

The previous prime is 16644391. The next prime is 16644403. The reversal of 16644402 is 20444661.

16644402 is a `hidden beast` number, since 16 + 644 + 4 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16475481 + 168921 = 4059^2 + 411^2 .

It is a super-3 number, since 3×16644402³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (16644403) 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, 4248 + ... + 7164.

Almost surely, 2^16644402 is an apocalyptic number.

16644402 is an abundant number, since it is smaller than the sum of its proper divisors (19544634).

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

16644402 is a wasteful number, since it uses less digits than its factorization.

16644402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242 (or 3239 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 16644402 is about 4079.7551397112. The cubic root of 16644402 is about 255.3226826169.

The spelling of 16644402 in words is "sixteen million, six hundred forty-four thousand, four hundred two".