664380 has 36 divisors (see below), whose sum is σ = 2015832. Its totient is φ = 177120.

The previous prime is 664379. The next prime is 664381. The reversal of 664380 is 83466.

It is an interprime number because it is at equal distance from previous prime (664379) and next prime (664381).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1666 + ... + 2025.

2⁶⁶⁴³⁸⁰ is an apocalyptic number.

664380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664380 is an abundant number, since it is smaller than the sum of its proper divisors (1351452).

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

664380 is a wasteful number, since it uses less digits than its factorization.

664380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706 (or 3701 counting only the distinct ones).

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

The square root of 664380 is about 815.0950864776. The cubic root of 664380 is about 87.2580526936.

The spelling of 664380 in words is "six hundred sixty-four thousand, three hundred eighty".