28884505 has 16 divisors (see below), whose sum is σ = 37754640. Its totient is φ = 21086208.

The previous prime is 28884497. The next prime is 28884577. The reversal of 28884505 is 50548882.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6869641 + 22014864 = 2621^2 + 4692^2 .

It is not a de Polignac number, because 28884505 - 2³ = 28884497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3289 + ... + 8281.

It is an arithmetic number, because the mean of its divisors is an integer number (2359665).

Almost surely, 2^28884505 is an apocalyptic number.

It is an amenable number.

28884505 is a deficient number, since it is larger than the sum of its proper divisors (8870135).

28884505 is a wasteful number, since it uses less digits than its factorization.

28884505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100.

The product of its (nonzero) digits is 102400, while the sum is 40.

The square root of 28884505 is about 5374.4306675219. The cubic root of 28884505 is about 306.8232810359.

The spelling of 28884505 in words is "twenty-eight million, eight hundred eighty-four thousand, five hundred five".