664743 has 4 divisors (see below), whose sum is σ = 886328. Its totient is φ = 443160.

The previous prime is 664739. The next prime is 664757. The reversal of 664743 is 347466.

664743 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 664743 - 2² = 664739 is a prime.

It is a D-number.

It is a Duffinian number.

664743 is strictly pandigital in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 664743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110788 + ... + 110793.

It is an arithmetic number, because the mean of its divisors is an integer number (221582).

2⁶⁶⁴⁷⁴³ is an apocalyptic number.

664743 is a deficient number, since it is larger than the sum of its proper divisors (221585).

664743 is a wasteful number, since it uses less digits than its factorization.

664743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221584.

The product of its digits is 12096, while the sum is 30.

The square root of 664743 is about 815.3177294773. The cubic root of 664743 is about 87.2739416458.

The spelling of 664743 in words is "six hundred sixty-four thousand, seven hundred forty-three".