31445072 has 20 divisors (see below), whose sum is σ = 61555956. Its totient is φ = 15559680.

The previous prime is 31445041. The next prime is 31445093. The reversal of 31445072 is 27054413.

It can be written as a sum of positive squares in 2 ways, for example, as 5271616 + 26173456 = 2296^2 + 5116^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8579 + ... + 11682.

Almost surely, 2^31445072 is an apocalyptic number.

It is an amenable number.

31445072 is a deficient number, since it is larger than the sum of its proper divisors (30110884).

31445072 is a wasteful number, since it uses less digits than its factorization.

31445072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20366 (or 20360 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 31445072 is about 5607.5905699329. The cubic root of 31445072 is about 315.6343042972.

Adding to 31445072 its reverse (27054413), we get a palindrome (58499485).

The spelling of 31445072 in words is "thirty-one million, four hundred forty-five thousand, seventy-two".