31216664 has 16 divisors (see below), whose sum is σ = 59524200. Its totient is φ = 15343552.

The previous prime is 31216663. The next prime is 31216687. The reversal of 31216664 is 46661213.

It is a happy number.

It is a super-2 number, since 2×31216664² = 1948960222577792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31216663) 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, 32597 + ... + 33540.

Almost surely, 2^31216664 is an apocalyptic number.

It is an amenable number.

31216664 is a deficient number, since it is larger than the sum of its proper divisors (28307536).

31216664 is a wasteful number, since it uses less digits than its factorization.

31216664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66202 (or 66198 counting only the distinct ones).

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

The square root of 31216664 is about 5587.1874856675. The cubic root of 31216664 is about 314.8682206823.

Adding to 31216664 its reverse (46661213), we get a palindrome (77877877).

The spelling of 31216664 in words is "thirty-one million, two hundred sixteen thousand, six hundred sixty-four".