664741 has 16 divisors (see below), whose sum is σ = 846720. Its totient is φ = 506880.

The previous prime is 664739. The next prime is 664757. The reversal of 664741 is 147466.

It is not a de Polignac number, because 664741 - 2¹ = 664739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6805 + ... + 6901.

It is an arithmetic number, because the mean of its divisors is an integer number (52920).

2⁶⁶⁴⁷⁴¹ is an apocalyptic number.

It is an amenable number.

664741 is a deficient number, since it is larger than the sum of its proper divisors (181979).

664741 is a wasteful number, since it uses less digits than its factorization.

664741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204.

The product of its digits is 4032, while the sum is 28.

The square root of 664741 is about 815.3165029607. The cubic root of 664741 is about 87.2738541192.

The spelling of 664741 in words is "six hundred sixty-four thousand, seven hundred forty-one".