16644026 has 12 divisors (see below), whose sum is σ = 29042298. Its totient is φ = 7133112.

The previous prime is 16644013. The next prime is 16644029. The reversal of 16644026 is 62044661.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 1002001 = 3955^2 + 1001^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16644026.

It is not an unprimeable number, because it can be changed into a prime (16644029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84821 + ... + 85016.

Almost surely, 2^16644026 is an apocalyptic number.

16644026 is a deficient number, since it is larger than the sum of its proper divisors (12398272).

16644026 is a wasteful number, since it uses less digits than its factorization.

16644026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169853 (or 169846 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 16644026 is about 4079.7090582540. The cubic root of 16644026 is about 255.3207600075.

Adding to 16644026 its reverse (62044661), we get a palindrome (78688687).

The spelling of 16644026 in words is "sixteen million, six hundred forty-four thousand, twenty-six".