31144460 has 48 divisors (see below), whose sum is σ = 68124672. Its totient is φ = 11947200.

The previous prime is 31144457. The next prime is 31144471. The reversal of 31144460 is 6444113.

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 15 ways as a sum of consecutive naturals, for example, 118289 + ... + 118551.

It is an arithmetic number, because the mean of its divisors is an integer number (1419264).

Almost surely, 2^31144460 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 31144460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34062336).

31144460 is an abundant number, since it is smaller than the sum of its proper divisors (36980212).

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

31144460 is a wasteful number, since it uses less digits than its factorization.

31144460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 31144460 is about 5580.7221754895. The cubic root of 31144460 is about 314.6252703571.

Adding to 31144460 its reverse (6444113), we get a palindrome (37588573).

The spelling of 31144460 in words is "thirty-one million, one hundred forty-four thousand, four hundred sixty".