664958 has 8 divisors (see below), whose sum is σ = 1139952. Its totient is φ = 284976.

The previous prime is 664949. The next prime is 664967. The reversal of 664958 is 859466.

It is an interprime number because it is at equal distance from previous prime (664949) and next prime (664967).

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

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 664958.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23735 + ... + 23762.

It is an arithmetic number, because the mean of its divisors is an integer number (142494).

2⁶⁶⁴⁹⁵⁸ is an apocalyptic number.

664958 is a deficient number, since it is larger than the sum of its proper divisors (474994).

664958 is a wasteful number, since it uses less digits than its factorization.

664958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47506.

The product of its digits is 51840, while the sum is 38.

The square root of 664958 is about 815.4495692561. The cubic root of 664958 is about 87.2833497303.

The spelling of 664958 in words is "six hundred sixty-four thousand, nine hundred fifty-eight".