28688212 has 12 divisors (see below), whose sum is σ = 57376480. Its totient is φ = 12294936.

The previous prime is 28688173. The next prime is 28688213. The reversal of 28688212 is 21288682.

28688212 is an admirable number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28688213) 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, 512262 + ... + 512317.

Almost surely, 2^28688212 is an apocalyptic number.

It is an amenable number.

28688212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28688212 is a wasteful number, since it uses less digits than its factorization.

28688212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024590 (or 1024588 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 28688212 is about 5356.1377876227. The cubic root of 28688212 is about 306.1266652054.

It can be divided in two parts, 28688 and 212, that added together give a square (28900 = 170²).

The spelling of 28688212 in words is "twenty-eight million, six hundred eighty-eight thousand, two hundred twelve".