631403540 has 24 divisors (see below), whose sum is σ = 1326471552. Its totient is φ = 252461600.

The previous prime is 631403533. The next prime is 631403543. The reversal of 631403540 is 45304136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631403543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66065 + ... + 75015.

It is an arithmetic number, because the mean of its divisors is an integer number (55269648).

Almost surely, 2^631403540 is an apocalyptic number.

It is an amenable number.

631403540 is an abundant number, since it is smaller than the sum of its proper divisors (695068012).

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

631403540 is a wasteful number, since it uses less digits than its factorization.

631403540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12487 (or 12485 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 631403540 is about 25127.7444272263. The cubic root of 631403540 is about 857.8980305282.

Adding to 631403540 its reverse (45304136), we get a palindrome (676707676).

The spelling of 631403540 in words is "six hundred thirty-one million, four hundred three thousand, five hundred forty".