631020240 has 160 divisors (see below), whose sum is σ = 2182003200. Its totient is φ = 167616000.

The previous prime is 631020233. The next prime is 631020253. The reversal of 631020240 is 42020136.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 839865 + ... + 840615.

It is an arithmetic number, because the mean of its divisors is an integer number (13637520).

Almost surely, 2^631020240 is an apocalyptic number.

631020240 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 631020240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091001600).

631020240 is an abundant number, since it is smaller than the sum of its proper divisors (1550982960).

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

631020240 is a wasteful number, since it uses less digits than its factorization.

631020240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162 (or 1150 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 631020240 is about 25120.1162417693. The cubic root of 631020240 is about 857.7243967863.

Adding to 631020240 its reverse (42020136), we get a palindrome (673040376).

The spelling of 631020240 in words is "six hundred thirty-one million, twenty thousand, two hundred forty".