1660320 has 72 divisors (see below), whose sum is σ = 5670756. Its totient is φ = 442368.

The previous prime is 1660297. The next prime is 1660357. The reversal of 1660320 is 230661.

It is a happy number.

1660320 is a `hidden beast` number, since 1 + 660 + 3 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1648656 + 11664 = 1284^2 + 108^2 .

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 (18).

It is a junction number, because it is equal to n+sod(n) for n = 1660293 and 1660302.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 864 + ... + 2016.

2^1660320 is an apocalyptic number.

1660320 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 1660320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2835378).

1660320 is an abundant number, since it is smaller than the sum of its proper divisors (4010436).

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

1660320 is a wasteful number, since it uses less digits than its factorization.

1660320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174 (or 1163 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1660320 is about 1288.5340507724. The cubic root of 1660320 is about 118.4124226070.

Adding to 1660320 its reverse (230661), we get a palindrome (1890981).

The spelling of 1660320 in words is "one million, six hundred sixty thousand, three hundred twenty".