28771855 has 16 divisors (see below), whose sum is σ = 40002624. Its totient is φ = 19457280.

The previous prime is 28771819. The next prime is 28771889. The reversal of 28771855 is 55817782.

It is not a de Polignac number, because 28771855 - 2⁷ = 28771727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3076 + ... + 8185.

It is an arithmetic number, because the mean of its divisors is an integer number (2500164).

Almost surely, 2^28771855 is an apocalyptic number.

28771855 is a deficient number, since it is larger than the sum of its proper divisors (11230769).

28771855 is a wasteful number, since it uses less digits than its factorization.

28771855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11346.

The product of its digits is 156800, while the sum is 43.

The square root of 28771855 is about 5363.9402494808. The cubic root of 28771855 is about 306.4238895845.

The spelling of 28771855 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred fifty-five".