31680056 has 8 divisors (see below), whose sum is σ = 59400120. Its totient is φ = 15840024.

The previous prime is 31680053. The next prime is 31680073. The reversal of 31680056 is 65008613.

31680056 is nontrivially palindromic in base 3.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31680053) 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 as a sum of consecutive naturals, namely, 1979996 + ... + 1980011.

It is an arithmetic number, because the mean of its divisors is an integer number (7425015).

Almost surely, 2^31680056 is an apocalyptic number.

It is an amenable number.

31680056 is a deficient number, since it is larger than the sum of its proper divisors (27720064).

31680056 is a wasteful number, since it uses less digits than its factorization.

31680056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960013 (or 3960009 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 31680056 is about 5628.5038864693. The cubic root of 31680056 is about 316.4185821803.

Adding to 31680056 its reverse (65008613), we get a palindrome (96688669).

The spelling of 31680056 in words is "thirty-one million, six hundred eighty thousand, fifty-six".