664727 has 4 divisors (see below), whose sum is σ = 759696. Its totient is φ = 569760.

The previous prime is 664711. The next prime is 664739. The reversal of 664727 is 727466.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 664727 - 2⁴ = 664711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664693 and 664702.

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 664727.

It is not an unprimeable number, because it can be changed into a prime (664757) 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, 47474 + ... + 47487.

It is an arithmetic number, because the mean of its divisors is an integer number (189924).

2⁶⁶⁴⁷²⁷ is an apocalyptic number.

664727 is a deficient number, since it is larger than the sum of its proper divisors (94969).

664727 is an equidigital number, since it uses as much as digits as its factorization.

664727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94968.

The product of its digits is 14112, while the sum is 32.

The square root of 664727 is about 815.3079172926. The cubic root of 664727 is about 87.2732414282.

The spelling of 664727 in words is "six hundred sixty-four thousand, seven hundred twenty-seven".