28231011 has 12 divisors (see below), whose sum is σ = 42288792. Its totient is φ = 18820512.

The previous prime is 28230991. The next prime is 28231013. The reversal of 28231011 is 11013282.

It is not a de Polignac number, because 28231011 - 2⁶ = 28230947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28231013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57846 + ... + 58331.

It is an arithmetic number, because the mean of its divisors is an integer number (3524066).

Almost surely, 2^28231011 is an apocalyptic number.

28231011 is a deficient number, since it is larger than the sum of its proper divisors (14057781).

28231011 is an equidigital number, since it uses as much as digits as its factorization.

28231011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116192 (or 116180 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 28231011 is about 5313.2862712261. The cubic root of 28231011 is about 304.4917127498.

Adding to 28231011 its reverse (11013282), we get a palindrome (39244293).

The spelling of 28231011 in words is "twenty-eight million, two hundred thirty-one thousand, eleven".