28809055 has 8 divisors (see below), whose sum is σ = 37713744. Its totient is φ = 20952000.

The previous prime is 28809037. The next prime is 28809059. The reversal of 28809055 is 55090882.

It is a happy number.

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

It is not a de Polignac number, because 28809055 - 2⁵ = 28809023 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 (28809059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261846 + ... + 261955.

It is an arithmetic number, because the mean of its divisors is an integer number (4714218).

Almost surely, 2^28809055 is an apocalyptic number.

28809055 is a deficient number, since it is larger than the sum of its proper divisors (8904689).

28809055 is a wasteful number, since it uses less digits than its factorization.

28809055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523817.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 28809055 is about 5367.4067295110. The cubic root of 28809055 is about 306.5558942760. Note that the first 3 decimals are identical.

It can be divided in two parts, 2880 and 9055, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 28809055 in words is "twenty-eight million, eight hundred nine thousand, fifty-five".