31664322140 has 96 divisors (see below), whose sum is σ = 75047249088. Its totient is φ = 11121920000.

The previous prime is 31664322139. The next prime is 31664322223. The reversal of 31664322140 is 4122346613.

It is a junction number, because it is equal to n+sod(n) for n = 31664322097 and 31664322106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 893642 + ... + 928398.

It is an arithmetic number, because the mean of its divisors is an integer number (781742178).

Almost surely, 2^31664322140 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 31664322140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37523624544).

31664322140 is an abundant number, since it is smaller than the sum of its proper divisors (43382926948).

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

31664322140 is a wasteful number, since it uses less digits than its factorization.

31664322140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34919 (or 34917 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 31664322140 its reverse (4122346613), we get a palindrome (35786668753).

The spelling of 31664322140 in words is "thirty-one billion, six hundred sixty-four million, three hundred twenty-two thousand, one hundred forty".