28152012 has 48 divisors (see below), whose sum is σ = 76116992. Its totient is φ = 7931520.

The previous prime is 28152001. The next prime is 28152043. The reversal of 28152012 is 21025182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 28152012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3837 + ... + 8427.

Almost surely, 2^28152012 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 28152012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38058496).

28152012 is an abundant number, since it is smaller than the sum of its proper divisors (47964980).

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

28152012 is a wasteful number, since it uses less digits than its factorization.

28152012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4678 (or 4676 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 28152012 is about 5305.8469634923. The cubic root of 28152012 is about 304.2074271099.

Adding to 28152012 its reverse (21025182), we get a palindrome (49177194).

The spelling of 28152012 in words is "twenty-eight million, one hundred fifty-two thousand, twelve".