28454511 has 4 divisors (see below), whose sum is σ = 37939352. Its totient is φ = 18969672.

The previous prime is 28454507. The next prime is 28454513. The reversal of 28454511 is 11545482.

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

It is not a de Polignac number, because 28454511 - 2² = 28454507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28454513) 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, 4742416 + ... + 4742421.

It is an arithmetic number, because the mean of its divisors is an integer number (9484838).

Almost surely, 2^28454511 is an apocalyptic number.

28454511 is a deficient number, since it is larger than the sum of its proper divisors (9484841).

28454511 is an equidigital number, since it uses as much as digits as its factorization.

28454511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9484840.

The product of its digits is 6400, while the sum is 30.

The square root of 28454511 is about 5334.2769894335. The cubic root of 28454511 is about 305.2931375051.

Adding to 28454511 its reverse (11545482), we get a palindrome (39999993).

The spelling of 28454511 in words is "twenty-eight million, four hundred fifty-four thousand, five hundred eleven".