1664080 has 80 divisors (see below), whose sum is σ = 4428288. Its totient is φ = 576000.

The previous prime is 1664071. The next prime is 1664083. The reversal of 1664080 is 804661.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27250 + ... + 27310.

2^1664080 is an apocalyptic number.

1664080 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 1664080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2214144).

1664080 is an abundant number, since it is smaller than the sum of its proper divisors (2764208).

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

1664080 is a wasteful number, since it uses less digits than its factorization.

1664080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1664080 is about 1289.9922480387. The cubic root of 1664080 is about 118.5017417418.

The spelling of 1664080 in words is "one million, six hundred sixty-four thousand, eighty".