631530240 has 144 divisors (see below), whose sum is σ = 2200455936. Its totient is φ = 153088000.

The previous prime is 631530217. The next prime is 631530259. The reversal of 631530240 is 42035136.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 631530240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34765 + ... + 49715.

It is an arithmetic number, because the mean of its divisors is an integer number (15280944).

Almost surely, 2^631530240 is an apocalyptic number.

631530240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631530240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100227968).

631530240 is an abundant number, since it is smaller than the sum of its proper divisors (1568925696).

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

631530240 is a wasteful number, since it uses less digits than its factorization.

631530240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14986 (or 14972 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 631530240 is about 25130.2654184153. The cubic root of 631530240 is about 857.9554097919.

Adding to 631530240 its reverse (42035136), we get a palindrome (673565376).

The spelling of 631530240 in words is "six hundred thirty-one million, five hundred thirty thousand, two hundred forty".