664080 has 40 divisors (see below), whose sum is σ = 2059392. Its totient is φ = 177024.

The previous prime is 664067. The next prime is 664091. The reversal of 664080 is 80466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 664080.

It is an unprimeable number.

664080 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1144 + ... + 1623.

2⁶⁶⁴⁰⁸⁰ is an apocalyptic number.

664080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664080 is an abundant number, since it is smaller than the sum of its proper divisors (1395312).

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

664080 is a wasteful number, since it uses less digits than its factorization.

664080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783 (or 2777 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 664080 is about 814.9110380894. The cubic root of 664080 is about 87.2449169596.

The spelling of 664080 in words is "six hundred sixty-four thousand, eighty".