31830072320 has 88 divisors (see below), whose sum is σ = 78131107824. Its totient is φ = 12435849216.

The previous prime is 31830072311. The next prime is 31830072343. The reversal of 31830072320 is 2327003813.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147872 + ... + 292448.

It is an arithmetic number, because the mean of its divisors is an integer number (887853498).

Almost surely, 2^31830072320 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 31830072320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39065553912).

31830072320 is an abundant number, since it is smaller than the sum of its proper divisors (46301035504).

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

31830072320 is a wasteful number, since it uses less digits than its factorization.

31830072320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144645 (or 144627 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The spelling of 31830072320 in words is "thirty-one billion, eight hundred thirty million, seventy-two thousand, three hundred twenty".