31730896 has 20 divisors (see below), whose sum is σ = 61566372. Its totient is φ = 15842816.

The previous prime is 31730873. The next prime is 31730899. The reversal of 31730896 is 69803713.

It can be written as a sum of positive squares in 2 ways, for example, as 11155600 + 20575296 = 3340^2 + 4536^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31730899) 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, 19656 + ... + 21208.

Almost surely, 2^31730896 is an apocalyptic number.

It is an amenable number.

31730896 is a deficient number, since it is larger than the sum of its proper divisors (29835476).

31730896 is a wasteful number, since it uses less digits than its factorization.

31730896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838 (or 2832 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 31730896 is about 5633.0183738383. The cubic root of 31730896 is about 316.5877540518.

It can be divided in two parts, 317 and 30896, that added together give a palindrome (31213).

The spelling of 31730896 in words is "thirty-one million, seven hundred thirty thousand, eight hundred ninety-six".