663958 has 8 divisors (see below), whose sum is σ = 1028160. Its totient is φ = 321240.

The previous prime is 663937. The next prime is 663959. The reversal of 663958 is 859366.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663959) 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, 5293 + ... + 5416.

It is an arithmetic number, because the mean of its divisors is an integer number (128520).

2⁶⁶³⁹⁵⁸ is an apocalyptic number.

663958 is a deficient number, since it is larger than the sum of its proper divisors (364202).

663958 is a wasteful number, since it uses less digits than its factorization.

663958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10742.

The product of its digits is 38880, while the sum is 37.

The square root of 663958 is about 814.8361798546. The cubic root of 663958 is about 87.2395739629.

The spelling of 663958 in words is "six hundred sixty-three thousand, nine hundred fifty-eight".