631315440 has 120 divisors (see below), whose sum is σ = 2423068128. Its totient is φ = 144299520.

The previous prime is 631315429. The next prime is 631315441. The reversal of 631315440 is 44513136.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631315441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57591 + ... + 67670.

Almost surely, 2^631315440 is an apocalyptic number.

631315440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631315440 is an abundant number, since it is smaller than the sum of its proper divisors (1791752688).

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

631315440 is a wasteful number, since it uses less digits than its factorization.

631315440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125287 (or 125278 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 631315440 is about 25125.9913237269. The cubic root of 631315440 is about 857.8581277152.

Adding to 631315440 its reverse (44513136), we get a palindrome (675828576).

The spelling of 631315440 in words is "six hundred thirty-one million, three hundred fifteen thousand, four hundred forty".