28765645 has 16 divisors (see below), whose sum is σ = 35608320. Its totient is φ = 22296384.

The previous prime is 28765643. The next prime is 28765657. The reversal of 28765645 is 54656782.

It is a cyclic number.

It is not a de Polignac number, because 28765645 - 2¹ = 28765643 is a prime.

It is a super-3 number, since 3×28765645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28765643) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 25054 + ... + 26176.

It is an arithmetic number, because the mean of its divisors is an integer number (2225520).

Almost surely, 2^28765645 is an apocalyptic number.

It is an amenable number.

28765645 is a deficient number, since it is larger than the sum of its proper divisors (6842675).

28765645 is a wasteful number, since it uses less digits than its factorization.

28765645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284.

The product of its digits is 403200, while the sum is 43.

The square root of 28765645 is about 5363.3613527339. The cubic root of 28765645 is about 306.4018422368.

The spelling of 28765645 in words is "twenty-eight million, seven hundred sixty-five thousand, six hundred forty-five".