16660872 has 72 divisors (see below), whose sum is σ = 47697390. Its totient is φ = 5253120.

The previous prime is 16660871. The next prime is 16660879. The reversal of 16660872 is 27806661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10929636 + 5731236 = 3306^2 + 2394^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16660871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25672 + ... + 26312.

Almost surely, 2^16660872 is an apocalyptic number.

16660872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16660872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23848695).

16660872 is an abundant number, since it is smaller than the sum of its proper divisors (31036518).

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

16660872 is a wasteful number, since it uses less digits than its factorization.

16660872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 16660872 is about 4081.7731441127. The cubic root of 16660872 is about 255.4068706482.

The spelling of 16660872 in words is "sixteen million, six hundred sixty thousand, eight hundred seventy-two".