28087155 has 24 divisors (see below), whose sum is σ = 50489712. Its totient is φ = 14979168.

The previous prime is 28087141. The next prime is 28087159. The reversal of 28087155 is 55178082.

It is not a de Polignac number, because 28087155 - 2⁴ = 28087139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28087159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10344 + ... + 12773.

It is an arithmetic number, because the mean of its divisors is an integer number (2103738).

Almost surely, 2^28087155 is an apocalyptic number.

28087155 is a deficient number, since it is larger than the sum of its proper divisors (22402557).

28087155 is an equidigital number, since it uses as much as digits as its factorization.

28087155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23137 (or 23125 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 28087155 is about 5299.7315969773. The cubic root of 28087155 is about 303.9736350346.

The spelling of 28087155 in words is "twenty-eight million, eighty-seven thousand, one hundred fifty-five".