631868 has 12 divisors (see below), whose sum is σ = 1129632. Its totient is φ = 309120.

The previous prime is 631867. The next prime is 631889. The reversal of 631868 is 868136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631861) 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, 1493 + ... + 1868.

It is an arithmetic number, because the mean of its divisors is an integer number (94136).

2⁶³¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

631868 is a deficient number, since it is larger than the sum of its proper divisors (497764).

631868 is a wasteful number, since it uses less digits than its factorization.

631868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3412 (or 3410 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 631868 is about 794.9012517288. The cubic root of 631868 is about 85.8108335366.

The spelling of 631868 in words is "six hundred thirty-one thousand, eight hundred sixty-eight".