31345328 has 40 divisors (see below), whose sum is σ = 69757440. Its totient is φ = 13366080.

The previous prime is 31345283. The next prime is 31345333. The reversal of 31345328 is 82354313.

It is a self number, because there is not a number n which added to its sum of digits gives 31345328.

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 7 ways as a sum of consecutive naturals, for example, 26183 + ... + 27353.

It is an arithmetic number, because the mean of its divisors is an integer number (1743936).

Almost surely, 2^31345328 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 31345328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34878720).

31345328 is an abundant number, since it is smaller than the sum of its proper divisors (38412112).

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

31345328 is a wasteful number, since it uses less digits than its factorization.

31345328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425 (or 1419 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 31345328 is about 5598.6898467409. The cubic root of 31345328 is about 315.3002193618.

The spelling of 31345328 in words is "thirty-one million, three hundred forty-five thousand, three hundred twenty-eight".