31640454312 has 64 divisors (see below), whose sum is σ = 80731442880. Its totient is φ = 10330125312.

The previous prime is 31640454301. The next prime is 31640454361. The reversal of 31640454312 is 21345404613.

It is a happy number.

It is a super-2 number, since 2×31640454312² (a number of 22 digits) contains 22 as substring.

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, 733323 + ... + 775269.

It is an arithmetic number, because the mean of its divisors is an integer number (1261428795).

Almost surely, 2^31640454312 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 31640454312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40365721440).

31640454312 is an abundant number, since it is smaller than the sum of its proper divisors (49090988568).

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

31640454312 is a wasteful number, since it uses less digits than its factorization.

31640454312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42602 (or 42598 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 31640454312 its reverse (21345404613), we get a palindrome (52985858925).

The spelling of 31640454312 in words is "thirty-one billion, six hundred forty million, four hundred fifty-four thousand, three hundred twelve".