31332664 has 32 divisors (see below), whose sum is σ = 64915200. Its totient is φ = 14058720.

The previous prime is 31332641. The next prime is 31332667. The reversal of 31332664 is 46623313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31332667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4699 + ... + 9205.

It is an arithmetic number, because the mean of its divisors is an integer number (2028600).

Almost surely, 2^31332664 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 31332664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32457600).

31332664 is an abundant number, since it is smaller than the sum of its proper divisors (33582536).

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

31332664 is a wasteful number, since it uses less digits than its factorization.

31332664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4603 (or 4599 counting only the distinct ones).

The product of its digits is 7776, while the sum is 28.

The square root of 31332664 is about 5597.5587535996. The cubic root of 31332664 is about 315.2577515780.

Adding to 31332664 its reverse (46623313), we get a palindrome (77955977).

The spelling of 31332664 in words is "thirty-one million, three hundred thirty-two thousand, six hundred sixty-four".