31440442332 has 96 divisors (see below), whose sum is σ = 79530857280. Its totient is φ = 9609707520.

The previous prime is 31440442331. The next prime is 31440442351. The reversal of 31440442332 is 23324404413.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31440442332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440442331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22898398 + ... + 22899770.

It is an arithmetic number, because the mean of its divisors is an integer number (828446430).

Almost surely, 2^31440442332 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 31440442332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39765428640).

31440442332 is an abundant number, since it is smaller than the sum of its proper divisors (48090414948).

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

31440442332 is a wasteful number, since it uses less digits than its factorization.

31440442332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2261 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 31440442332 its reverse (23324404413), we get a palindrome (54764846745).

The spelling of 31440442332 in words is "thirty-one billion, four hundred forty million, four hundred forty-two thousand, three hundred thirty-two".