664290 has 72 divisors (see below), whose sum is σ = 1929564. Its totient is φ = 158400.

The previous prime is 664289. The next prime is 664319. The reversal of 664290 is 92466.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 88209 = 759^2 + 297^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664290.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10860 + ... + 10920.

2⁶⁶⁴²⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964782).

664290 is an abundant number, since it is smaller than the sum of its proper divisors (1265274).

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

664290 is a wasteful number, since it uses less digits than its factorization.

664290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 664290 is about 815.0398763251. The cubic root of 664290 is about 87.2541123887.

It can be divided in two parts, 66 and 4290, that added together give a square (4356 = 66²).

The spelling of 664290 in words is "six hundred sixty-four thousand, two hundred ninety".