16621552 has 20 divisors (see below), whose sum is σ = 32316880. Its totient is φ = 8281728.

The previous prime is 16621543. The next prime is 16621559. The reversal of 16621552 is 25512661.

It is a self number, because there is not a number n which added to its sum of digits gives 16621552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16621559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3349 + ... + 6667.

It is an arithmetic number, because the mean of its divisors is an integer number (1615844).

Almost surely, 2^16621552 is an apocalyptic number.

It is an amenable number.

16621552 is a deficient number, since it is larger than the sum of its proper divisors (15695328).

16621552 is a wasteful number, since it uses less digits than its factorization.

16621552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640 (or 3634 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 16621552 is about 4076.9537647611. The cubic root of 16621552 is about 255.2057905612.

The spelling of 16621552 in words is "sixteen million, six hundred twenty-one thousand, five hundred fifty-two".