16623380 has 24 divisors (see below), whose sum is σ = 36114120. Its totient is φ = 6419840.

The previous prime is 16623379. The next prime is 16623391. The reversal of 16623380 is 8332661.

It can be written as a sum of positive squares in 4 ways, for example, as 6370576 + 10252804 = 2524^2 + 3202^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 13751 + ... + 14910.

It is an arithmetic number, because the mean of its divisors is an integer number (1504755).

Almost surely, 2^16623380 is an apocalyptic number.

16623380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16623380 is an abundant number, since it is smaller than the sum of its proper divisors (19490740).

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

16623380 is a wasteful number, since it uses less digits than its factorization.

16623380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28699 (or 28697 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 16623380 is about 4077.1779455893. The cubic root of 16623380 is about 255.2151458666.

The spelling of 16623380 in words is "sixteen million, six hundred twenty-three thousand, three hundred eighty".