31286328 has 16 divisors (see below), whose sum is σ = 78215880. Its totient is φ = 10428768.

The previous prime is 31286309. The next prime is 31286329. The reversal of 31286328 is 82368213.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31286329) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 651775 + ... + 651822.

Almost surely, 2^31286328 is an apocalyptic number.

It is an amenable number.

31286328 is an abundant number, since it is smaller than the sum of its proper divisors (46929552).

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

31286328 is a wasteful number, since it uses less digits than its factorization.

31286328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303606 (or 1303602 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 31286328 is about 5593.4182750801. The cubic root of 31286328 is about 315.1022696400.

The spelling of 31286328 in words is "thirty-one million, two hundred eighty-six thousand, three hundred twenty-eight".