28533011 has 4 divisors (see below), whose sum is σ = 30727872. Its totient is φ = 26338152.

The previous prime is 28532971. The next prime is 28533017. The reversal of 28533011 is 11033582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28533011 - 2¹⁴ = 28516627 is a prime.

It is a super-2 number, since 2×28533011² = 1628265433452242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28533017) 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, 1097411 + ... + 1097436.

It is an arithmetic number, because the mean of its divisors is an integer number (7681968).

Almost surely, 2^28533011 is an apocalyptic number.

28533011 is a deficient number, since it is larger than the sum of its proper divisors (2194861).

28533011 is a wasteful number, since it uses less digits than its factorization.

28533011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194860.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 28533011 is about 5341.6299946739. The cubic root of 28533011 is about 305.5736262052.

Adding to 28533011 its reverse (11033582), we get a palindrome (39566593).

The spelling of 28533011 in words is "twenty-eight million, five hundred thirty-three thousand, eleven".