31685259648 has 192 divisors, whose sum is σ = 98515206720. Its totient is φ = 8996520960.

The previous prime is 31685259637. The next prime is 31685259649. The reversal of 31685259648 is 84695258613.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×31685259648² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31685259649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3061843 + ... + 3072173.

It is an arithmetic number, because the mean of its divisors is an integer number (513100035).

Almost surely, 2^31685259648 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 31685259648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49257603360).

31685259648 is an abundant number, since it is smaller than the sum of its proper divisors (66829947072).

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

31685259648 is a wasteful number, since it uses less digits than its factorization.

31685259648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10525 (or 10506 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 57.

The spelling of 31685259648 in words is "thirty-one billion, six hundred eighty-five million, two hundred fifty-nine thousand, six hundred forty-eight".