31897684548 has 96 divisors (see below), whose sum is σ = 84148955520. Its totient is φ = 10446796800.

The previous prime is 31897684547. The next prime is 31897684589. The reversal of 31897684548 is 84548679813.

31897684548 is a `hidden beast` number, since 3 + 1 + 8 + 9 + 7 + 6 + 84 + 548 = 666.

It is not an unprimeable number, because it can be changed into a prime (31897684541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2896140 + ... + 2907132.

It is an arithmetic number, because the mean of its divisors is an integer number (876551620).

Almost surely, 2^31897684548 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 31897684548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42074477760).

31897684548 is an abundant number, since it is smaller than the sum of its proper divisors (52251270972).

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

31897684548 is a wasteful number, since it uses less digits than its factorization.

31897684548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11474 (or 11466 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 31897684548 in words is "thirty-one billion, eight hundred ninety-seven million, six hundred eighty-four thousand, five hundred forty-eight".