16666672 has 40 divisors (see below), whose sum is σ = 35457552. Its totient is φ = 7526400.

The previous prime is 16666669. The next prime is 16666711. The reversal of 16666672 is 27666661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49288 + ... + 49624.

Almost surely, 2^16666672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16666672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17728776).

16666672 is an abundant number, since it is smaller than the sum of its proper divisors (18790880).

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

16666672 is a wasteful number, since it uses less digits than its factorization.

16666672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 631 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The square root of 16666672 is about 4082.4835578358. The cubic root of 16666672 is about 255.4365047111.

It can be divided in two parts, 1666 and 6672, that added together give a palindrome (8338).

The spelling of 16666672 in words is "sixteen million, six hundred sixty-six thousand, six hundred seventy-two".