1666080 has 144 divisors (see below), whose sum is σ = 6191640. Its totient is φ = 405504.

The previous prime is 1666061. The next prime is 1666081. The reversal of 1666080 is 806661.

It can be written as a sum of positive squares in 4 ways, for example, as 767376 + 898704 = 876^2 + 948^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (1666081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18676 + ... + 18764.

2^1666080 is an apocalyptic number.

1666080 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 1666080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3095820).

1666080 is an abundant number, since it is smaller than the sum of its proper divisors (4525560).

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

1666080 is a wasteful number, since it uses less digits than its factorization.

1666080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1666080 is about 1290.7672137144. The cubic root of 1666080 is about 118.5491971122.

The spelling of 1666080 in words is "one million, six hundred sixty-six thousand, eighty".