28151212 has 12 divisors (see below), whose sum is σ = 49717360. Its totient is φ = 13946256.

The previous prime is 28151177. The next prime is 28151213. The reversal of 28151212 is 21215182.

It is not an unprimeable number, because it can be changed into a prime (28151213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31848 + ... + 32719.

Almost surely, 2^28151212 is an apocalyptic number.

It is an amenable number.

28151212 is a deficient number, since it is larger than the sum of its proper divisors (21566148).

28151212 is a wasteful number, since it uses less digits than its factorization.

28151212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64680 (or 64678 counting only the distinct ones).

The product of its digits is 320, while the sum is 22.

The square root of 28151212 is about 5305.7715744272. The cubic root of 28151212 is about 304.2045455130.

Adding to 28151212 its reverse (21215182), we get a palindrome (49366394).

The spelling of 28151212 in words is "twenty-eight million, one hundred fifty-one thousand, two hundred twelve".