31006228 has 12 divisors (see below), whose sum is σ = 59193792. Its totient is φ = 14093720.

The previous prime is 31006123. The next prime is 31006243. The reversal of 31006228 is 82260013.

It is a super-2 number, since 2×31006228² = 1922772349575968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31006199 and 31006208.

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, 352300 + ... + 352387.

It is an arithmetic number, because the mean of its divisors is an integer number (4932816).

Almost surely, 2^31006228 is an apocalyptic number.

It is an amenable number.

31006228 is a deficient number, since it is larger than the sum of its proper divisors (28187564).

31006228 is a wasteful number, since it uses less digits than its factorization.

31006228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704702 (or 704700 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 31006228 is about 5568.3236256525. The cubic root of 31006228 is about 314.1591009474.

The spelling of 31006228 in words is "thirty-one million, six thousand, two hundred twenty-eight".