31680165840 has 80 divisors (see below), whose sum is σ = 98277186048. Its totient is φ = 8442137088.

The previous prime is 31680165757. The next prime is 31680165871. The reversal of 31680165840 is 4856108613.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 31680165792 and 31680165801.

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 15 ways as a sum of consecutive naturals, for example, 303297 + ... + 394143.

Almost surely, 2^31680165840 is an apocalyptic number.

31680165840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31680165840 is an abundant number, since it is smaller than the sum of its proper divisors (66597020208).

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

31680165840 is a wasteful number, since it uses less digits than its factorization.

31680165840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92316 (or 92310 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 31680165840 in words is "thirty-one billion, six hundred eighty million, one hundred sixty-five thousand, eight hundred forty".