631928 has 32 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 278880.

The previous prime is 631927. The next prime is 631931. The reversal of 631928 is 829136.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 631928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631927) 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, 3701 + ... + 3867.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2⁶³¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665280).

631928 is an abundant number, since it is smaller than the sum of its proper divisors (698632).

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

631928 is a wasteful number, since it uses less digits than its factorization.

631928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 223 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 631928 is about 794.9389913698. The cubic root of 631928 is about 85.8135495506.

It can be divided in two parts, 63 and 1928, that added together give a palindrome (1991).

The spelling of 631928 in words is "six hundred thirty-one thousand, nine hundred twenty-eight".