31316224240 has 80 divisors (see below), whose sum is σ = 83431802880. Its totient is φ = 10708588800.

The previous prime is 31316224237. The next prime is 31316224279. The reversal of 31316224240 is 4242261313.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 31316224199 and 31316224208.

It is a congruent number.

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, 138465 + ... + 286015.

It is an arithmetic number, because the mean of its divisors is an integer number (1042897536).

Almost surely, 2^31316224240 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 31316224240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41715901440).

31316224240 is an abundant number, since it is smaller than the sum of its proper divisors (52115578640).

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

31316224240 is a wasteful number, since it uses less digits than its factorization.

31316224240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147950 (or 147944 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 31316224240 its reverse (4242261313), we get a palindrome (35558485553).

The spelling of 31316224240 in words is "thirty-one billion, three hundred sixteen million, two hundred twenty-four thousand, two hundred forty".