31330067840 has 64 divisors (see below), whose sum is σ = 75228741360. Its totient is φ = 12476762112.

The previous prime is 31330067837. The next prime is 31330067891. The reversal of 31330067840 is 4876003313.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 31330067840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37454 + ... + 253106.

Almost surely, 2^31330067840 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 31330067840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37614370680).

31330067840 is an abundant number, since it is smaller than the sum of its proper divisors (43898673520).

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

31330067840 is a wasteful number, since it uses less digits than its factorization.

31330067840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215899 (or 215887 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 31330067840 in words is "thirty-one billion, three hundred thirty million, sixty-seven thousand, eight hundred forty".