664754 has 8 divisors (see below), whose sum is σ = 1000620. Its totient is φ = 331216.

The previous prime is 664739. The next prime is 664757. The reversal of 664754 is 457466.

It can be written as a sum of positive squares in 2 ways, for example, as 664225 + 529 = 815^2 + 23^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 664754.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664754.

It is not an unprimeable number, because it can be changed into a prime (664757) by changing a digit.

664754 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 3 ways as a sum of consecutive naturals, for example, 692 + ... + 1344.

2⁶⁶⁴⁷⁵⁴ is an apocalyptic number.

664754 is a deficient number, since it is larger than the sum of its proper divisors (335866).

664754 is a wasteful number, since it uses less digits than its factorization.

664754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its digits is 20160, while the sum is 32.

The square root of 664754 is about 815.3244752858. The cubic root of 664754 is about 87.2744230389.

The spelling of 664754 in words is "six hundred sixty-four thousand, seven hundred fifty-four".