31351303680 has 160 divisors (see below), whose sum is σ = 104584449024. Its totient is φ = 7996809216.

The previous prime is 31351303639. The next prime is 31351303681. The reversal of 31351303680 is 8630315313.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31351303681) 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 15 ways as a sum of consecutive naturals, for example, 87897 + ... + 265383.

Almost surely, 2^31351303680 is an apocalyptic number.

31351303680 is a gapful number since it is divisible by the number (30) 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 31351303680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52292224512).

31351303680 is an abundant number, since it is smaller than the sum of its proper divisors (73233145344).

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

31351303680 is a wasteful number, since it uses less digits than its factorization.

31351303680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177536 (or 177520 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

Adding to 31351303680 its reverse (8630315313), we get a palindrome (39981618993).

The spelling of 31351303680 in words is "thirty-one billion, three hundred fifty-one million, three hundred three thousand, six hundred eighty".