16440660 has 72 divisors (see below), whose sum is σ = 50286600. Its totient is φ = 4347648.

The previous prime is 16440629. The next prime is 16440673. The reversal of 16440660 is 6604461.

It can be written as a sum of positive squares in 4 ways, for example, as 1089936 + 15350724 = 1044^2 + 3918^2 .

It is a super-3 number, since 3×16440660³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26514 + ... + 27126.

It is an arithmetic number, because the mean of its divisors is an integer number (698425).

Almost surely, 2^16440660 is an apocalyptic number.

16440660 is a gapful number since it is divisible by the number (10) 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 16440660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25143300).

16440660 is an abundant number, since it is smaller than the sum of its proper divisors (33845940).

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

16440660 is a wasteful number, since it uses less digits than its factorization.

16440660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 16440660 is about 4054.7083742237. The cubic root of 16440660 is about 254.2766118744.

The spelling of 16440660 in words is "sixteen million, four hundred forty thousand, six hundred sixty".