16623636 has 12 divisors (see below), whose sum is σ = 38788512. Its totient is φ = 5541208.

The previous prime is 16623623. The next prime is 16623653. The reversal of 16623636 is 63632661.

It is a happy number.

16623636 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

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

It is a junction number, because it is equal to n+sod(n) for n = 16623597 and 16623606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692640 + ... + 692663.

It is an arithmetic number, because the mean of its divisors is an integer number (3232376).

Almost surely, 2^16623636 is an apocalyptic number.

It is an amenable number.

16623636 is an abundant number, since it is smaller than the sum of its proper divisors (22164876).

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

16623636 is a wasteful number, since it uses less digits than its factorization.

16623636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385310 (or 1385308 counting only the distinct ones).

The product of its digits is 23328, while the sum is 33.

The square root of 16623636 is about 4077.2093397323. The cubic root of 16623636 is about 255.2164559640.

The spelling of 16623636 in words is "sixteen million, six hundred twenty-three thousand, six hundred thirty-six".