31697168 has 40 divisors (see below), whose sum is σ = 65233920. Its totient is φ = 14878080.

The previous prime is 31697161. The next prime is 31697173. The reversal of 31697168 is 86179613.

It is not an unprimeable number, because it can be changed into a prime (31697161) 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 7 ways as a sum of consecutive naturals, for example, 38198 + ... + 39018.

It is an arithmetic number, because the mean of its divisors is an integer number (1630848).

Almost surely, 2^31697168 is an apocalyptic number.

31697168 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31697168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32616960).

31697168 is an abundant number, since it is smaller than the sum of its proper divisors (33536752).

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

31697168 is a wasteful number, since it uses less digits than its factorization.

31697168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 969 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 31697168 is about 5630.0238010154. The cubic root of 31697168 is about 316.4755431505.

The spelling of 31697168 in words is "thirty-one million, six hundred ninety-seven thousand, one hundred sixty-eight".