16623520 has 48 divisors (see below), whose sum is σ = 39680928. Its totient is φ = 6580480.

The previous prime is 16623517. The next prime is 16623539. The reversal of 16623520 is 2532661.

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, 16635 + ... + 17605.

It is an arithmetic number, because the mean of its divisors is an integer number (826686).

Almost surely, 2^16623520 is an apocalyptic number.

16623520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16623520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19840464).

16623520 is an abundant number, since it is smaller than the sum of its proper divisors (23057408).

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

16623520 is a wasteful number, since it uses less digits than its factorization.

16623520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 16623520 is about 4077.1951142912. The cubic root of 16623520 is about 255.2158623277.

The spelling of 16623520 in words is "sixteen million, six hundred twenty-three thousand, five hundred twenty".