663887 has 4 divisors (see below), whose sum is σ = 758736. Its totient is φ = 569040.

The previous prime is 663881. The next prime is 663893. The reversal of 663887 is 788366.

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

It is an interprime number because it is at equal distance from previous prime (663881) and next prime (663893).

It is a cyclic number.

It is not a de Polignac number, because 663887 - 2⁶ = 663823 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663881) 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, 47414 + ... + 47427.

It is an arithmetic number, because the mean of its divisors is an integer number (189684).

2⁶⁶³⁸⁸⁷ is an apocalyptic number.

663887 is a deficient number, since it is larger than the sum of its proper divisors (94849).

663887 is an equidigital number, since it uses as much as digits as its factorization.

663887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94848.

The product of its digits is 48384, while the sum is 38.

The square root of 663887 is about 814.7926116504. The cubic root of 663887 is about 87.2364642127.

The spelling of 663887 in words is "six hundred sixty-three thousand, eight hundred eighty-seven".