28123065 has 16 divisors (see below), whose sum is σ = 49996800. Its totient is φ = 14998896.

The previous prime is 28123063. The next prime is 28123087. The reversal of 28123065 is 56032182.

It is not a de Polignac number, because 28123065 - 2¹ = 28123063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28123063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104025 + ... + 104294.

It is an arithmetic number, because the mean of its divisors is an integer number (3124800).

Almost surely, 2^28123065 is an apocalyptic number.

It is an amenable number.

28123065 is a deficient number, since it is larger than the sum of its proper divisors (21873735).

28123065 is a wasteful number, since it uses less digits than its factorization.

28123065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208333 (or 208327 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28123065 is about 5303.1184222116. The cubic root of 28123065 is about 304.1031253604.

The spelling of 28123065 in words is "twenty-eight million, one hundred twenty-three thousand, sixty-five".