31230028 has 24 divisors (see below), whose sum is σ = 56335104. Its totient is φ = 15139200.

The previous prime is 31229999. The next prime is 31230029. The reversal of 31230028 is 82003213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31229987 and 31230014.

It is not an unprimeable number, because it can be changed into a prime (31230029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30826 + ... + 31822.

It is an arithmetic number, because the mean of its divisors is an integer number (2347296).

Almost surely, 2^31230028 is an apocalyptic number.

It is an amenable number.

31230028 is a deficient number, since it is larger than the sum of its proper divisors (25105076).

31230028 is a wasteful number, since it uses less digits than its factorization.

31230028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1231 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 31230028 is about 5588.3833082565. The cubic root of 31230028 is about 314.9131464584.

The spelling of 31230028 in words is "thirty-one million, two hundred thirty thousand, twenty-eight".