31664216 has 16 divisors (see below), whose sum is σ = 59640000. Its totient is φ = 15760224.

The previous prime is 31664209. The next prime is 31664221. The reversal of 31664216 is 61246613.

It is a happy number.

It is a super-3 number, since 3×31664216³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 7091 + ... + 10658.

It is an arithmetic number, because the mean of its divisors is an integer number (3727500).

Almost surely, 2^31664216 is an apocalyptic number.

It is an amenable number.

31664216 is a deficient number, since it is larger than the sum of its proper divisors (27975784).

31664216 is a wasteful number, since it uses less digits than its factorization.

31664216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17978 (or 17974 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 31664216 is about 5627.0965870509. The cubic root of 31664216 is about 316.3658370514.

The spelling of 31664216 in words is "thirty-one million, six hundred sixty-four thousand, two hundred sixteen".