16561672 has 32 divisors (see below), whose sum is σ = 33592320. Its totient is φ = 7624960.

The previous prime is 16561669. The next prime is 16561691. The reversal of 16561672 is 27616561.

It is a happy number.

16561672 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 (34).

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

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, 5097 + ... + 7687.

It is an arithmetic number, because the mean of its divisors is an integer number (1049760).

Almost surely, 2^16561672 is an apocalyptic number.

It is an amenable number.

16561672 is an abundant number, since it is smaller than the sum of its proper divisors (17030648).

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

16561672 is a wasteful number, since it uses less digits than its factorization.

16561672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661 (or 2657 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 16561672 is about 4069.6034204821. The cubic root of 16561672 is about 254.8989577893.

The spelling of 16561672 in words is "sixteen million, five hundred sixty-one thousand, six hundred seventy-two".