31216020480 has 264 divisors, whose sum is σ = 109229426592. Its totient is φ = 8242200576.

The previous prime is 31216020443. The next prime is 31216020491. The reversal of 31216020480 is 8402061213.

31216020480 is a `hidden beast` number, since 3 + 1 + 2 + 160 + 20 + 480 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4742952 + ... + 4749528.

It is an arithmetic number, because the mean of its divisors is an integer number (413747828).

Almost surely, 2^31216020480 is an apocalyptic number.

31216020480 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31216020480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54614713296).

31216020480 is an abundant number, since it is smaller than the sum of its proper divisors (78013406112).

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

31216020480 is a wasteful number, since it uses less digits than its factorization.

31216020480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711 (or 6690 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 31216020480 its reverse (8402061213), we get a palindrome (39618081693).

The spelling of 31216020480 in words is "thirty-one billion, two hundred sixteen million, twenty thousand, four hundred eighty".