31685340078 has 192 divisors, whose sum is σ = 86385761280. Its totient is φ = 8497239552.

The previous prime is 31685340059. The next prime is 31685340079. The reversal of 31685340078 is 87004358613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31685340079) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37765183 + ... + 37766021.

It is an arithmetic number, because the mean of its divisors is an integer number (449925840).

Almost surely, 2^31685340078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31685340078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43192880640).

31685340078 is an abundant number, since it is smaller than the sum of its proper divisors (54700421202).

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

31685340078 is a wasteful number, since it uses less digits than its factorization.

31685340078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533 (or 1521 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 31685340078 in words is "thirty-one billion, six hundred eighty-five million, three hundred forty thousand, seventy-eight".