31368402320 has 40 divisors (see below), whose sum is σ = 72938992320. Its totient is φ = 12546078080.

The previous prime is 31368402311. The next prime is 31368402323. The reversal of 31368402320 is 2320486313.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (31368402323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342901 + ... + 1366059.

It is an arithmetic number, because the mean of its divisors is an integer number (1823474808).

Almost surely, 2^31368402320 is an apocalyptic number.

It is an amenable number.

31368402320 is an abundant number, since it is smaller than the sum of its proper divisors (41570590000).

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

31368402320 is a wasteful number, since it uses less digits than its factorization.

31368402320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40103 (or 40097 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 31368402320 its reverse (2320486313), we get a palindrome (33688888633).

The spelling of 31368402320 in words is "thirty-one billion, three hundred sixty-eight million, four hundred two thousand, three hundred twenty".