28212188 has 12 divisors (see below), whose sum is σ = 51969960. Its totient is φ = 13363632.

The previous prime is 28212187. The next prime is 28212211. The reversal of 28212188 is 88121282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28212187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185531 + ... + 185682.

It is an arithmetic number, because the mean of its divisors is an integer number (4330830).

Almost surely, 2^28212188 is an apocalyptic number.

It is an amenable number.

28212188 is a deficient number, since it is larger than the sum of its proper divisors (23757772).

28212188 is a wasteful number, since it uses less digits than its factorization.

28212188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371236 (or 371234 counting only the distinct ones).

The product of its digits is 4096, while the sum is 32.

The square root of 28212188 is about 5311.5146615631. The cubic root of 28212188 is about 304.4240245163.

The spelling of 28212188 in words is "twenty-eight million, two hundred twelve thousand, one hundred eighty-eight".