28740065 has 16 divisors (see below), whose sum is σ = 36465600. Its totient is φ = 21684672.

The previous prime is 28740059. The next prime is 28740067. The reversal of 28740065 is 56004782.

It is a cyclic number.

It is not a de Polignac number, because 28740065 - 2¹² = 28735969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28740067) by changing a digit.

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, 26351 + ... + 27419.

It is an arithmetic number, because the mean of its divisors is an integer number (2279100).

Almost surely, 2^28740065 is an apocalyptic number.

It is an amenable number.

28740065 is a deficient number, since it is larger than the sum of its proper divisors (7725535).

28740065 is a wasteful number, since it uses less digits than its factorization.

28740065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 28740065 is about 5360.9761238043. The cubic root of 28740065 is about 306.3109921559.

The spelling of 28740065 in words is "twenty-eight million, seven hundred forty thousand, sixty-five".