28912011 has 8 divisors (see below), whose sum is σ = 39489744. Its totient is φ = 18804480.

The previous prime is 28912007. The next prime is 28912031. The reversal of 28912011 is 11021982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28912011 - 2² = 28912007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28912001) by changing a digit.

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, 117406 + ... + 117651.

It is an arithmetic number, because the mean of its divisors is an integer number (4936218).

Almost surely, 2^28912011 is an apocalyptic number.

28912011 is a deficient number, since it is larger than the sum of its proper divisors (10577733).

28912011 is a wasteful number, since it uses less digits than its factorization.

28912011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235101.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 28912011 is about 5376.9890273275. The cubic root of 28912011 is about 306.9206435455.

Adding to 28912011 its reverse (11021982), we get a palindrome (39933993).

The spelling of 28912011 in words is "twenty-eight million, nine hundred twelve thousand, eleven".