31200000320 has 112 divisors (see below), whose sum is σ = 80902454400. Its totient is φ = 11415398400.

The previous prime is 31200000277. The next prime is 31200000323. The reversal of 31200000320 is 2300000213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200000323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87845 + ... + 264795.

Almost surely, 2^31200000320 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 31200000320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40451227200).

31200000320 is an abundant number, since it is smaller than the sum of its proper divisors (49702454080).

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

31200000320 is a wasteful number, since it uses less digits than its factorization.

31200000320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177016 (or 177006 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 31200000320 its reverse (2300000213), we get a palindrome (33500000533).

The spelling of 31200000320 in words is "thirty-one billion, two hundred million, three hundred twenty", and thus it is an aban number.