31330228 has 6 divisors (see below), whose sum is σ = 54827906. Its totient is φ = 15665112.

The previous prime is 31330223. The next prime is 31330249. The reversal of 31330228 is 82203313.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30935844 + 394384 = 5562^2 + 628^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31330199 and 31330208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3916275 + ... + 3916282.

Almost surely, 2^31330228 is an apocalyptic number.

It is an amenable number.

31330228 is a deficient number, since it is larger than the sum of its proper divisors (23497678).

31330228 is a wasteful number, since it uses less digits than its factorization.

31330228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832561 (or 7832559 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 31330228 is about 5597.3411545126. The cubic root of 31330228 is about 315.2495813206.

The spelling of 31330228 in words is "thirty-one million, three hundred thirty thousand, two hundred twenty-eight".