664797 has 8 divisors (see below), whose sum is σ = 1013056. Its totient is φ = 379872.

The previous prime is 664793. The next prime is 664799. The reversal of 664797 is 797466.

664797 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 664797 - 2² = 664793 is a prime.

It is a Duffinian number.

664797 is strictly pandigital in base 7.

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 7 ways as a sum of consecutive naturals, for example, 15808 + ... + 15849.

It is an arithmetic number, because the mean of its divisors is an integer number (126632).

2⁶⁶⁴⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

664797 is a deficient number, since it is larger than the sum of its proper divisors (348259).

664797 is a wasteful number, since it uses less digits than its factorization.

664797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31667.

The product of its digits is 63504, while the sum is 39.

The square root of 664797 is about 815.3508447288. The cubic root of 664797 is about 87.2763047973.

The spelling of 664797 in words is "six hundred sixty-four thousand, seven hundred ninety-seven".