28440511 has 16 divisors (see below), whose sum is σ = 33465600. Its totient is φ = 23889600.

The previous prime is 28440491. The next prime is 28440521. The reversal of 28440511 is 11504482.

It is a cyclic number.

It is not a de Polignac number, because 28440511 - 2¹³ = 28432319 is a prime.

It is a super-3 number, since 3×28440511³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6910 + ... + 10228.

It is an arithmetic number, because the mean of its divisors is an integer number (2091600).

Almost surely, 2^28440511 is an apocalyptic number.

28440511 is a deficient number, since it is larger than the sum of its proper divisors (5025089).

28440511 is a wasteful number, since it uses less digits than its factorization.

28440511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 28440511 is about 5332.9645601673. The cubic root of 28440511 is about 305.2430598555.

Adding to 28440511 its reverse (11504482), we get a palindrome (39944993).

The spelling of 28440511 in words is "twenty-eight million, four hundred forty thousand, five hundred eleven".