28538806 has 4 divisors (see below), whose sum is σ = 42808212. Its totient is φ = 14269402.

The previous prime is 28538773. The next prime is 28538819. The reversal of 28538806 is 60883582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60883582 = 2 ⋅30441791.

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 as a sum of consecutive naturals, namely, 7134700 + ... + 7134703.

It is an arithmetic number, because the mean of its divisors is an integer number (10702053).

Almost surely, 2^28538806 is an apocalyptic number.

28538806 is a deficient number, since it is larger than the sum of its proper divisors (14269406).

28538806 is a wasteful number, since it uses less digits than its factorization.

28538806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14269405.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28538806 is about 5342.1724045560. The cubic root of 28538806 is about 305.5943119447.

The spelling of 28538806 in words is "twenty-eight million, five hundred thirty-eight thousand, eight hundred six".