631004040 has 128 divisors (see below), whose sum is σ = 2175984000. Its totient is φ = 162457344.

The previous prime is 631004029. The next prime is 631004071. The reversal of 631004040 is 40400136.

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

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, 21247 + ... + 41393.

It is an arithmetic number, because the mean of its divisors is an integer number (16999875).

Almost surely, 2^631004040 is an apocalyptic number.

631004040 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 631004040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087992000).

631004040 is an abundant number, since it is smaller than the sum of its proper divisors (1544979960).

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

631004040 is a wasteful number, since it uses less digits than its factorization.

631004040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20196 (or 20186 counting only the distinct ones).

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

The square root of 631004040 is about 25119.7937889625. The cubic root of 631004040 is about 857.7170566867.

Adding to 631004040 its reverse (40400136), we get a palindrome (671404176).

The spelling of 631004040 in words is "six hundred thirty-one million, four thousand, forty".