631213240 has 64 divisors (see below), whose sum is σ = 1632960000. Its totient is φ = 215104128.

The previous prime is 631213207. The next prime is 631213259. The reversal of 631213240 is 42312136.

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, 40011 + ... + 53509.

It is an arithmetic number, because the mean of its divisors is an integer number (25515000).

Almost surely, 2^631213240 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 631213240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816480000).

631213240 is an abundant number, since it is smaller than the sum of its proper divisors (1001746760).

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

631213240 is a wasteful number, since it uses less digits than its factorization.

631213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13684 (or 13680 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 631213240 is about 25123.9574908094. The cubic root of 631213240 is about 857.8118339892.

Adding to 631213240 its reverse (42312136), we get a palindrome (673525376).

The spelling of 631213240 in words is "six hundred thirty-one million, two hundred thirteen thousand, two hundred forty".