664454 has 16 divisors (see below), whose sum is σ = 1176576. Its totient is φ = 275400.

The previous prime is 664441. The next prime is 664459. The reversal of 664454 is 454466.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664454.

It is not an unprimeable number, because it can be changed into a prime (664459) by changing a digit.

664454 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 7 ways as a sum of consecutive naturals, for example, 332 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (73536).

2⁶⁶⁴⁴⁵⁴ is an apocalyptic number.

664454 is a deficient number, since it is larger than the sum of its proper divisors (512122).

664454 is a wasteful number, since it uses less digits than its factorization.

664454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its digits is 11520, while the sum is 29.

The square root of 664454 is about 815.1404786906. The cubic root of 664454 is about 87.2612922334.

The spelling of 664454 in words is "six hundred sixty-four thousand, four hundred fifty-four".