631304 has 32 divisors (see below), whose sum is σ = 1278720. Its totient is φ = 291456.

The previous prime is 631291. The next prime is 631307. The reversal of 631304 is 403136.

631304 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (631307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8612 + ... + 8684.

It is an arithmetic number, because the mean of its divisors is an integer number (39960).

2⁶³¹³⁰⁴ is an apocalyptic number.

It is an amenable number.

631304 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631304 is a wasteful number, since it uses less digits than its factorization.

631304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 631304 is about 794.5464114827. The cubic root of 631304 is about 85.7852945965.

The spelling of 631304 in words is "six hundred thirty-one thousand, three hundred four".