31208228 has 12 divisors (see below), whose sum is σ = 54792192. Its totient is φ = 15553320.

The previous prime is 31208213. The next prime is 31208231. The reversal of 31208228 is 82280213.

It is a junction number, because it is equal to n+sod(n) for n = 31208197 and 31208206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11300 + ... + 13787.

It is an arithmetic number, because the mean of its divisors is an integer number (4566016).

Almost surely, 2^31208228 is an apocalyptic number.

It is an amenable number.

31208228 is a deficient number, since it is larger than the sum of its proper divisors (23583964).

31208228 is a wasteful number, since it uses less digits than its factorization.

31208228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25402 (or 25400 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 31208228 is about 5586.4324931033. The cubic root of 31208228 is about 314.8398547684.

The spelling of 31208228 in words is "thirty-one million, two hundred eight thousand, two hundred twenty-eight".