28251011 has 2 divisors, whose sum is σ = 28251012. Its totient is φ = 28251010.

The previous prime is 28251007. The next prime is 28251037. The reversal of 28251011 is 11015282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28251011 - 2² = 28251007 is a prime.

It is not a weakly prime, because it can be changed into another prime (28251211) 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 as a sum of consecutive naturals, namely, 14125505 + 14125506.

It is an arithmetic number, because the mean of its divisors is an integer number (14125506).

Almost surely, 2^28251011 is an apocalyptic number.

28251011 is a deficient number, since it is larger than the sum of its proper divisors (1).

28251011 is an equidigital number, since it uses as much as digits as its factorization.

28251011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 28251011 is about 5315.1680123962. The cubic root of 28251011 is about 304.5636005605.

Adding to 28251011 its reverse (11015282), we get a palindrome (39266293).

The spelling of 28251011 in words is "twenty-eight million, two hundred fifty-one thousand, eleven".