28538805 has 32 divisors (see below), whose sum is σ = 46891008. Its totient is φ = 14817600.

The previous prime is 28538773. The next prime is 28538819. The reversal of 28538805 is 50883582.

It is not a de Polignac number, because 28538805 - 2⁵ = 28538773 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135150 + ... + 135360.

It is an arithmetic number, because the mean of its divisors is an integer number (1465344).

Almost surely, 2^28538805 is an apocalyptic number.

It is an amenable number.

28538805 is a deficient number, since it is larger than the sum of its proper divisors (18352203).

28538805 is a wasteful number, since it uses less digits than its factorization.

28538805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 28538805 is about 5342.1723109612. The cubic root of 28538805 is about 305.5943083754.

The spelling of 28538805 in words is "twenty-eight million, five hundred thirty-eight thousand, eight hundred five".