31718636 has 12 divisors (see below), whose sum is σ = 56448840. Its totient is φ = 15590400.

The previous prime is 31718623. The next prime is 31718639. The reversal of 31718636 is 63681713.

It is a junction number, because it is equal to n+sod(n) for n = 31718596 and 31718605.

It is not an unprimeable number, because it can be changed into a prime (31718639) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 66965 + ... + 67436.

It is an arithmetic number, because the mean of its divisors is an integer number (4704070).

Almost surely, 2^31718636 is an apocalyptic number.

It is an amenable number.

31718636 is a deficient number, since it is larger than the sum of its proper divisors (24730204).

31718636 is a wasteful number, since it uses less digits than its factorization.

31718636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134464 (or 134462 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 31718636 is about 5631.9300421791. The cubic root of 31718636 is about 316.5469750178.

The spelling of 31718636 in words is "thirty-one million, seven hundred eighteen thousand, six hundred thirty-six".