631067640 has 128 divisors (see below), whose sum is σ = 2196149760. Its totient is φ = 142078464.

The previous prime is 631067617. The next prime is 631067641. The reversal of 631067640 is 46760136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631067641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50674 + ... + 61886.

It is an arithmetic number, because the mean of its divisors is an integer number (17157420).

Almost surely, 2^631067640 is an apocalyptic number.

631067640 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 631067640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1098074880).

631067640 is an abundant number, since it is smaller than the sum of its proper divisors (1565082120).

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

631067640 is a wasteful number, since it uses less digits than its factorization.

631067640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11301 (or 11297 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 631067640 is about 25121.0596910242. The cubic root of 631067640 is about 857.7458726523.

The spelling of 631067640 in words is "six hundred thirty-one million, sixty-seven thousand, six hundred forty".