28019712 has 88 divisors (see below), whose sum is σ = 85417216. Its totient is φ = 7999488.

The previous prime is 28019707. The next prime is 28019729. The reversal of 28019712 is 21791082.

It is a self number, because there is not a number n which added to its sum of digits gives 28019712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20853 + ... + 22155.

Almost surely, 2^28019712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28019712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42708608).

28019712 is an abundant number, since it is smaller than the sum of its proper divisors (57397504).

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

28019712 is a wasteful number, since it uses less digits than its factorization.

28019712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333 (or 1315 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 28019712 is about 5293.3649033483. The cubic root of 28019712 is about 303.7301390933.

The spelling of 28019712 in words is "twenty-eight million, nineteen thousand, seven hundred twelve".