31671472 has 40 divisors (see below), whose sum is σ = 70995456. Its totient is φ = 13406016.

The previous prime is 31671449. The next prime is 31671481. The reversal of 31671472 is 27417613.

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 7 ways as a sum of consecutive naturals, for example, 7593 + ... + 10999.

Almost surely, 2^31671472 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 31671472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35497728).

31671472 is an abundant number, since it is smaller than the sum of its proper divisors (39323984).

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

31671472 is a wasteful number, since it uses less digits than its factorization.

31671472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505 (or 3499 counting only the distinct ones).

The product of its digits is 7056, while the sum is 31.

The square root of 31671472 is about 5627.7412875860. The cubic root of 31671472 is about 316.3900007655.

The spelling of 31671472 in words is "thirty-one million, six hundred seventy-one thousand, four hundred seventy-two".