31997064 has 64 divisors (see below), whose sum is σ = 91872000. Its totient is φ = 9184320.

The previous prime is 31997047. The next prime is 31997089. The reversal of 31997064 is 46079913.

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 15 ways as a sum of consecutive naturals, for example, 1827 + ... + 8205.

It is an arithmetic number, because the mean of its divisors is an integer number (1435500).

Almost surely, 2^31997064 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 31997064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45936000).

31997064 is an abundant number, since it is smaller than the sum of its proper divisors (59874936).

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

31997064 is a wasteful number, since it uses less digits than its factorization.

31997064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6418 (or 6414 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 31997064 is about 5656.5947353509. The cubic root of 31997064 is about 317.4705004936.

The spelling of 31997064 in words is "thirty-one million, nine hundred ninety-seven thousand, sixty-four".