28840511 has 8 divisors (see below), whose sum is σ = 33030144. Its totient is φ = 24668280.

The previous prime is 28840481. The next prime is 28840523. The reversal of 28840511 is 11504882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28840511 - 2¹⁴ = 28824127 is a prime.

It is a super-2 number, since 2×28840511² = 1663550149482242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28840531) 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 in 7 ways as a sum of consecutive naturals, for example, 575 + ... + 7616.

It is an arithmetic number, because the mean of its divisors is an integer number (4128768).

Almost surely, 2^28840511 is an apocalyptic number.

28840511 is a deficient number, since it is larger than the sum of its proper divisors (4189633).

28840511 is an equidigital number, since it uses as much as digits as its factorization.

28840511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8701.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 28840511 is about 5370.3362092145. The cubic root of 28840511 is about 306.6674276656.

The spelling of 28840511 in words is "twenty-eight million, eight hundred forty thousand, five hundred eleven".