31481472 has 128 divisors (see below), whose sum is σ = 94737600. Its totient is φ = 9175040.

The previous prime is 31481459. The next prime is 31481473. The reversal of 31481472 is 27418413.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (31481473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122368 + ... + 122624.

Almost surely, 2^31481472 is an apocalyptic number.

31481472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31481472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47368800).

31481472 is an abundant number, since it is smaller than the sum of its proper divisors (63256128).

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

31481472 is a wasteful number, since it uses less digits than its factorization.

31481472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 302 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 31481472 is about 5610.8352319419. The cubic root of 31481472 is about 315.7560473625.

Adding to 31481472 its reverse (27418413), we get a palindrome (58899885).

The spelling of 31481472 in words is "thirty-one million, four hundred eighty-one thousand, four hundred seventy-two".