16561472 has 28 divisors (see below), whose sum is σ = 34296096. Its totient is φ = 7920000.

The previous prime is 16561469. The next prime is 16561507. The reversal of 16561472 is 27416561.

16561472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 16.

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, 4154 + ... + 7097.

Almost surely, 2^16561472 is an apocalyptic number.

It is an amenable number.

16561472 is an abundant number, since it is smaller than the sum of its proper divisors (17734624).

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

16561472 is a wasteful number, since it uses less digits than its factorization.

16561472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11286 (or 11276 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 16561472 is about 4069.5788479891. The cubic root of 16561472 is about 254.8979317255.

The spelling of 16561472 in words is "sixteen million, five hundred sixty-one thousand, four hundred seventy-two".