631280 has 40 divisors (see below), whose sum is σ = 1583232. Its totient is φ = 232704.

The previous prime is 631273. The next prime is 631291. The reversal of 631280 is 82136.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737 + ... + 1343.

2⁶³¹²⁸⁰ 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 631280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791616).

631280 is an abundant number, since it is smaller than the sum of its proper divisors (951952).

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

631280 is a wasteful number, since it uses less digits than its factorization.

631280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 631280 is about 794.5313083825. The cubic root of 631280 is about 85.7842074958.

The spelling of 631280 in words is "six hundred thirty-one thousand, two hundred eighty".