663875 has 16 divisors (see below), whose sum is σ = 853632. Its totient is φ = 515200.

The previous prime is 663869. The next prime is 663881. The reversal of 663875 is 578366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (663869) and next prime (663881).

It is a de Polignac number, because none of the positive numbers 2^k-663875 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5819 + ... + 5931.

It is an arithmetic number, because the mean of its divisors is an integer number (53352).

2⁶⁶³⁸⁷⁵ is an apocalyptic number.

663875 is a deficient number, since it is larger than the sum of its proper divisors (189757).

663875 is a wasteful number, since it uses less digits than its factorization.

663875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 165 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 663875 is about 814.7852477801. The cubic root of 663875 is about 87.2359385992.

It can be divided in two parts, 6 and 63875, that multiplied together give a triangular number (383250 = T₈₇₅).

The spelling of 663875 in words is "six hundred sixty-three thousand, eight hundred seventy-five".