28523212 has 12 divisors (see below), whose sum is σ = 52851960. Its totient is φ = 13422656.

The previous prime is 28523179. The next prime is 28523213. The reversal of 28523212 is 21232582.

It is not an unprimeable number, because it can be changed into a prime (28523213) 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, 209662 + ... + 209797.

It is an arithmetic number, because the mean of its divisors is an integer number (4404330).

Almost surely, 2^28523212 is an apocalyptic number.

It is an amenable number.

28523212 is a deficient number, since it is larger than the sum of its proper divisors (24328748).

28523212 is a wasteful number, since it uses less digits than its factorization.

28523212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419480 (or 419478 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 28523212 is about 5340.7126865241. The cubic root of 28523212 is about 305.5386414782.

Adding to 28523212 its reverse (21232582), we get a palindrome (49755794).

The spelling of 28523212 in words is "twenty-eight million, five hundred twenty-three thousand, two hundred twelve".