664470 has 64 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 167904.

The previous prime is 664459. The next prime is 664471. The reversal of 664470 is 74466.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664470.

It is not an unprimeable number, because it can be changed into a prime (664471) by changing a digit.

664470 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6157 + ... + 6263.

It is an arithmetic number, because the mean of its divisors is an integer number (29160).

2⁶⁶⁴⁴⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933120).

664470 is an abundant number, since it is smaller than the sum of its proper divisors (1201770).

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

664470 is a wasteful number, since it uses less digits than its factorization.

664470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 664470 is about 815.1502928908. The cubic root of 664470 is about 87.2619926428.

The spelling of 664470 in words is "six hundred sixty-four thousand, four hundred seventy".