28531912 has 16 divisors (see below), whose sum is σ = 53619840. Its totient is φ = 14233296.

The previous prime is 28531907. The next prime is 28531913. The reversal of 28531912 is 21913582.

It is not an unprimeable number, because it can be changed into a prime (28531913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148 + ... + 7555.

It is an arithmetic number, because the mean of its divisors is an integer number (3351240).

Almost surely, 2^28531912 is an apocalyptic number.

It is an amenable number.

28531912 is a deficient number, since it is larger than the sum of its proper divisors (25087928).

28531912 is a wasteful number, since it uses less digits than its factorization.

28531912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8172 (or 8168 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 28531912 is about 5341.5271224623. The cubic root of 28531912 is about 305.5697029164.

The spelling of 28531912 in words is "twenty-eight million, five hundred thirty-one thousand, nine hundred twelve".