631288 has 16 divisors (see below), whose sum is σ = 1352880. Its totient is φ = 270528.

The previous prime is 631273. The next prime is 631291. The reversal of 631288 is 882136.

631288 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5581 + ... + 5692.

It is an arithmetic number, because the mean of its divisors is an integer number (84555).

2⁶³¹²⁸⁸ is an apocalyptic number.

It is an amenable number.

631288 is an abundant number, since it is smaller than the sum of its proper divisors (721592).

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

631288 is a wasteful number, since it uses less digits than its factorization.

631288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11286 (or 11282 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 631288 is about 794.5363427811. The cubic root of 631288 is about 85.7845698658.

It can be divided in two parts, 63128 and 8, that added together give a palindrome (63136).

The spelling of 631288 in words is "six hundred thirty-one thousand, two hundred eighty-eight".