31443320000 has 280 divisors, whose sum is σ = 81017528592. Its totient is φ = 12096000000.

The previous prime is 31443319991. The next prime is 31443320063. The reversal of 31443320000 is 2334413.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 173719910 + ... + 173720090.

Almost surely, 2^31443320000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31443320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40508764296).

31443320000 is an abundant number, since it is smaller than the sum of its proper divisors (49574208592).

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

31443320000 is a wasteful number, since it uses less digits than its factorization.

31443320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31443320000 its reverse (2334413), we get a palindrome (31445654413).

It can be divided in two parts, 314433 and 20000, that added together give a palindrome (334433).

The spelling of 31443320000 in words is "thirty-one billion, four hundred forty-three million, three hundred twenty thousand".