28287712 has 12 divisors (see below), whose sum is σ = 55691496. Its totient is φ = 14143840.

The previous prime is 28287709. The next prime is 28287737. The reversal of 28287712 is 21778282.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 441964 + ... + 442027.

It is an arithmetic number, because the mean of its divisors is an integer number (4640958).

Almost surely, 2^28287712 is an apocalyptic number.

It is an amenable number.

28287712 is a deficient number, since it is larger than the sum of its proper divisors (27403784).

28287712 is an equidigital number, since it uses as much as digits as its factorization.

28287712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884001 (or 883993 counting only the distinct ones).

The product of its digits is 25088, while the sum is 37.

The square root of 28287712 is about 5318.6193697237. The cubic root of 28287712 is about 304.6954300824.

The spelling of 28287712 in words is "twenty-eight million, two hundred eighty-seven thousand, seven hundred twelve".