31228 has 12 divisors (see below), whose sum is σ = 56392. Its totient is φ = 15120.

The previous prime is 31223. The next prime is 31231. The reversal of 31228 is 82213.

It is a happy number.

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223) by changing a digit.

31228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43 + ... + 253.

2³¹²²⁸ is an apocalyptic number.

It is an amenable number.

31228 is a deficient number, since it is larger than the sum of its proper divisors (25164).

31228 is a wasteful number, since it uses less digits than its factorization.

31228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 250 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 31228 is about 176.7144589444. The cubic root of 31228 is about 31.4906329753.

It can be divided in two parts, 3122 and 8, that multiplied together give a triangular number (24976 = T₂₂₃).

The spelling of 31228 in words is "thirty-one thousand, two hundred twenty-eight".