631864 has 16 divisors (see below), whose sum is σ = 1247400. Its totient is φ = 299232.

The previous prime is 631861. The next prime is 631867. The reversal of 631864 is 468136.

It is an interprime number because it is at equal distance from previous prime (631861) and next prime (631867).

It is a super-2 number, since 2×631864² = 798504228992, which contains 22 as substring.

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, 1927 + ... + 2230.

2⁶³¹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

631864 is a deficient number, since it is larger than the sum of its proper divisors (615536).

631864 is a wasteful number, since it uses less digits than its factorization.

631864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4182 (or 4178 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 631864 is about 794.8987356890. The cubic root of 631864 is about 85.8106524629.

It can be divided in two parts, 63186 and 4, that added together give a triangular number (63190 = T₃₅₅).

The spelling of 631864 in words is "six hundred thirty-one thousand, eight hundred sixty-four".