28087212 has 24 divisors (see below), whose sum is σ = 65654512. Its totient is φ = 9345600.

The previous prime is 28087207. The next prime is 28087217. The reversal of 28087212 is 21278082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28087207) and next prime (28087217).

It is a self number, because there is not a number n which added to its sum of digits gives 28087212.

It is not an unprimeable number, because it can be changed into a prime (28087217) 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 7 ways as a sum of consecutive naturals, for example, 6162 + ... + 9702.

Almost surely, 2^28087212 is an apocalyptic number.

It is an amenable number.

28087212 is an abundant number, since it is smaller than the sum of its proper divisors (37567300).

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

28087212 is a wasteful number, since it uses less digits than its factorization.

28087212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209 (or 4207 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28087212 is about 5299.7369746054. The cubic root of 28087212 is about 303.9738406622.

The spelling of 28087212 in words is "twenty-eight million, eighty-seven thousand, two hundred twelve".