664140 has 24 divisors (see below), whose sum is σ = 1859760. Its totient is φ = 177088.

The previous prime is 664133. The next prime is 664141. The reversal of 664140 is 41466.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664140.

It is not an unprimeable number, because it can be changed into a prime (664141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5475 + ... + 5594.

It is an arithmetic number, because the mean of its divisors is an integer number (77490).

2⁶⁶⁴¹⁴⁰ is an apocalyptic number.

664140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664140 is an abundant number, since it is smaller than the sum of its proper divisors (1195620).

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

664140 is a wasteful number, since it uses less digits than its factorization.

664140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11081 (or 11079 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 664140 is about 814.9478510923. The cubic root of 664140 is about 87.2475444229.

It can be divided in two parts, 6 and 64140, that added together give a palindrome (64146).

The spelling of 664140 in words is "six hundred sixty-four thousand, one hundred forty".