28911212 has 24 divisors (see below), whose sum is σ = 55956432. Its totient is φ = 12960000.

The previous prime is 28911199. The next prime is 28911263. The reversal of 28911212 is 21211982.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 1289 + ... + 7712.

It is an arithmetic number, because the mean of its divisors is an integer number (2331518).

Almost surely, 2^28911212 is an apocalyptic number.

28911212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28911212 is a deficient number, since it is larger than the sum of its proper divisors (27045220).

28911212 is a wasteful number, since it uses less digits than its factorization.

28911212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9089 (or 9087 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 28911212 is about 5376.9147287269. The cubic root of 28911212 is about 306.9178162101.

The spelling of 28911212 in words is "twenty-eight million, nine hundred eleven thousand, two hundred twelve".