631888 has 20 divisors (see below), whose sum is σ = 1243348. Its totient is φ = 311040.

The previous prime is 631867. The next prime is 631889. The reversal of 631888 is 888136.

It can be written as a sum of positive squares in 2 ways, for example, as 304704 + 327184 = 552^2 + 572^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631889) by changing a digit.

631888 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 898 + ... + 1438.

2⁶³¹⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

631888 is a deficient number, since it is larger than the sum of its proper divisors (611460).

631888 is a wasteful number, since it uses less digits than its factorization.

631888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 616 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 631888 is about 794.9138318082. The cubic root of 631888 is about 85.8117388937.

The spelling of 631888 in words is "six hundred thirty-one thousand, eight hundred eighty-eight".