31000230320 has 80 divisors (see below), whose sum is σ = 76390244640. Its totient is φ = 11659210752.

The previous prime is 31000230307. The next prime is 31000230377. The reversal of 31000230320 is 2303200013.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×31000230320² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000230295 and 31000230304.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1443179 + ... + 1464501.

It is an arithmetic number, because the mean of its divisors is an integer number (954878058).

Almost surely, 2^31000230320 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 31000230320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38195122320).

31000230320 is an abundant number, since it is smaller than the sum of its proper divisors (45390014320).

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

31000230320 is a wasteful number, since it uses less digits than its factorization.

31000230320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22422 (or 22416 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

Adding to 31000230320 its reverse (2303200013), we get a palindrome (33303430333).

The spelling of 31000230320 in words is "thirty-one billion, two hundred thirty thousand, three hundred twenty".