31680004 has 12 divisors (see below), whose sum is σ = 55720000. Its totient is φ = 15760008.

The previous prime is 31680001. The next prime is 31680007. The reversal of 31680004 is 40008613.

It is an interprime number because it is at equal distance from previous prime (31680001) and next prime (31680007).

It is not an unprimeable number, because it can be changed into a prime (31680001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19104 + ... + 20695.

Almost surely, 2^31680004 is an apocalyptic number.

It is an amenable number.

31680004 is a deficient number, since it is larger than the sum of its proper divisors (24039996).

31680004 is a wasteful number, since it uses less digits than its factorization.

31680004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40002 (or 40000 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 31680004 is about 5628.4992671226. The cubic root of 31680004 is about 316.4184090559.

Adding to 31680004 its reverse (40008613), we get a palindrome (71688617).

The spelling of 31680004 in words is "thirty-one million, six hundred eighty thousand, four".