28551011 has 4 divisors (see below), whose sum is σ = 29215032. Its totient is φ = 27886992.

The previous prime is 28551001. The next prime is 28551023. The reversal of 28551011 is 11015582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11015582 = 2 ⋅5507791.

It is a cyclic number.

It is not a de Polignac number, because 28551011 - 2⁶ = 28550947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28551001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331946 + ... + 332031.

It is an arithmetic number, because the mean of its divisors is an integer number (7303758).

Almost surely, 2^28551011 is an apocalyptic number.

28551011 is a deficient number, since it is larger than the sum of its proper divisors (664021).

28551011 is an equidigital number, since it uses as much as digits as its factorization.

28551011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664020.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 28551011 is about 5343.3146079938. The cubic root of 28551011 is about 305.6378695601.

Adding to 28551011 its reverse (11015582), we get a palindrome (39566593).

The spelling of 28551011 in words is "twenty-eight million, five hundred fifty-one thousand, eleven".