31680316 has 12 divisors (see below), whose sum is σ = 58701888. Its totient is φ = 14908352.

The previous prime is 31680307. The next prime is 31680317. The reversal of 31680316 is 61308613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31680317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232876 + ... + 233011.

It is an arithmetic number, because the mean of its divisors is an integer number (4891824).

Almost surely, 2^31680316 is an apocalyptic number.

It is an amenable number.

31680316 is a deficient number, since it is larger than the sum of its proper divisors (27021572).

31680316 is a wasteful number, since it uses less digits than its factorization.

31680316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465908 (or 465906 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 31680316 is about 5628.5269831458. The cubic root of 31680316 is about 316.4194477996.

Adding to 31680316 its reverse (61308613), we get a palindrome (92988929).

The spelling of 31680316 in words is "thirty-one million, six hundred eighty thousand, three hundred sixteen".