31385228 has 12 divisors (see below), whose sum is σ = 62770512. Its totient is φ = 13450800.

The previous prime is 31385209. The next prime is 31385231. The reversal of 31385228 is 82258313.

31385228 is an admirable number.

It is a super-2 number, since 2×31385228² = 1970065073223968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31385194 and 31385203.

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, 560423 + ... + 560478.

It is an arithmetic number, because the mean of its divisors is an integer number (5230876).

Almost surely, 2^31385228 is an apocalyptic number.

It is an amenable number.

31385228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31385228 is a wasteful number, since it uses less digits than its factorization.

31385228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120912 (or 1120910 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 31385228 is about 5602.2520471682. The cubic root of 31385228 is about 315.4339463035.

It can be divided in two parts, 31385 and 228, that added together give a palindrome (31613).

The spelling of 31385228 in words is "thirty-one million, three hundred eighty-five thousand, two hundred twenty-eight".