664241 has 8 divisors (see below), whose sum is σ = 721224. Its totient is φ = 609280.

The previous prime is 664211. The next prime is 664243. The reversal of 664241 is 142466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30625 + 633616 = 175^2 + 796^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664241 - 2⁶ = 664177 is a prime.

It is a super-2 number, since 2×664241² = 882432212162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (90153).

2⁶⁶⁴²⁴¹ is an apocalyptic number.

It is an amenable number.

664241 is a deficient number, since it is larger than the sum of its proper divisors (56983).

664241 is a wasteful number, since it uses less digits than its factorization.

664241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011.

The product of its digits is 1152, while the sum is 23.

The square root of 664241 is about 815.0098158918. The cubic root of 664241 is about 87.2519669619.

The spelling of 664241 in words is "six hundred sixty-four thousand, two hundred forty-one".