16623640 has 32 divisors (see below), whose sum is σ = 40804560. Its totient is φ = 6044800.

The previous prime is 16623623. The next prime is 16623653. The reversal of 16623640 is 4632661.

16623640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 16623599 and 16623608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18451 + ... + 19330.

Almost surely, 2^16623640 is an apocalyptic number.

16623640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16623640 is an abundant number, since it is smaller than the sum of its proper divisors (24180920).

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

16623640 is a wasteful number, since it uses less digits than its factorization.

16623640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37803 (or 37799 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 16623640 is about 4077.2098302638. The cubic root of 16623640 is about 255.2164764341.

The spelling of 16623640 in words is "sixteen million, six hundred twenty-three thousand, six hundred forty".