13031228 has 24 divisors (see below), whose sum is σ = 26191872. Its totient is φ = 5557104.

The previous prime is 13031201. The next prime is 13031233. The reversal of 13031228 is 82213031.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5201 + ... + 7287.

It is an arithmetic number, because the mean of its divisors is an integer number (1091328).

Almost surely, 2^13031228 is an apocalyptic number.

It is an amenable number.

13031228 is an abundant number, since it is smaller than the sum of its proper divisors (13160644).

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

13031228 is a wasteful number, since it uses less digits than its factorization.

13031228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321 (or 2319 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 13031228 is about 3609.8792223563. The cubic root of 13031228 is about 235.3215938061.

Adding to 13031228 its reverse (82213031), we get a palindrome (95244259).

The spelling of 13031228 in words is "thirteen million, thirty-one thousand, two hundred twenty-eight".