31716916 has 72 divisors (see below), whose sum is σ = 72164736. Its totient is φ = 12055680.

The previous prime is 31716913. The next prime is 31716943. The reversal of 31716916 is 61961713.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31716913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101176 + ... + 101488.

It is an arithmetic number, because the mean of its divisors is an integer number (1002288).

Almost surely, 2^31716916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31716916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36082368).

31716916 is an abundant number, since it is smaller than the sum of its proper divisors (40447820).

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

31716916 is a wasteful number, since it uses less digits than its factorization.

31716916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 380 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 31716916 is about 5631.7773393486. Note that the first 3 decimals coincide. The cubic root of 31716916 is about 316.5412531383.

The spelling of 31716916 in words is "thirty-one million, seven hundred sixteen thousand, nine hundred sixteen".