28529885 has 4 divisors (see below), whose sum is σ = 34235868. Its totient is φ = 22823904.

The previous prime is 28529869. The next prime is 28529911. The reversal of 28529885 is 58892582.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9467929 + 19061956 = 3077^2 + 4366^2 .

It is a cyclic number.

It is not a de Polignac number, because 28529885 - 2⁴ = 28529869 is a prime.

It is a super-2 number, since 2×28529885² = 1627908676226450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2852984 + ... + 2852993.

It is an arithmetic number, because the mean of its divisors is an integer number (8558967).

Almost surely, 2^28529885 is an apocalyptic number.

It is an amenable number.

28529885 is a deficient number, since it is larger than the sum of its proper divisors (5705983).

28529885 is an equidigital number, since it uses as much as digits as its factorization.

28529885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5705982.

The product of its digits is 460800, while the sum is 47.

The square root of 28529885 is about 5341.3373793461. The cubic root of 28529885 is about 305.5624665226.

The spelling of 28529885 in words is "twenty-eight million, five hundred twenty-nine thousand, eight hundred eighty-five".