31344128 has 40 divisors (see below), whose sum is σ = 64817280. Its totient is φ = 15124480.

The previous prime is 31344121. The next prime is 31344139. The reversal of 31344128 is 82144313.

It is a junction number, because it is equal to n+sod(n) for n = 31344097 and 31344106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31344121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13793 + ... + 15903.

It is an arithmetic number, because the mean of its divisors is an integer number (1620432).

Almost surely, 2^31344128 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 31344128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32408640).

31344128 is an abundant number, since it is smaller than the sum of its proper divisors (33473152).

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

31344128 is an equidigital number, since it uses as much as digits as its factorization.

31344128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158 (or 2142 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 31344128 is about 5598.5826777855. The cubic root of 31344128 is about 315.2961957415.

The spelling of 31344128 in words is "thirty-one million, three hundred forty-four thousand, one hundred twenty-eight".