28285812 has 18 divisors (see below), whose sum is σ = 71500338. Its totient is φ = 9428592.

The previous prime is 28285811. The next prime is 28285843. The reversal of 28285812 is 21858282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25341156 + 2944656 = 5034^2 + 1716^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 785717 = 28285812 / (2 + 8 + 2 + 8 + 5 + 8 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28285811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392823 + ... + 392894.

It is an arithmetic number, because the mean of its divisors is an integer number (3972241).

Almost surely, 2^28285812 is an apocalyptic number.

It is an amenable number.

28285812 is an abundant number, since it is smaller than the sum of its proper divisors (43214526).

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

28285812 is a wasteful number, since it uses less digits than its factorization.

28285812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785727 (or 785722 counting only the distinct ones).

The product of its digits is 20480, while the sum is 36.

The square root of 28285812 is about 5318.4407489414. The cubic root of 28285812 is about 304.6886081064.

The spelling of 28285812 in words is "twenty-eight million, two hundred eighty-five thousand, eight hundred twelve".