28780045 has 16 divisors (see below), whose sum is σ = 39777408. Its totient is φ = 19581120.

The previous prime is 28780039. The next prime is 28780049. The reversal of 28780045 is 54008782.

It is not a de Polignac number, because 28780045 - 2¹¹ = 28777997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780049) 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, 1447 + ... + 7723.

It is an arithmetic number, because the mean of its divisors is an integer number (2486088).

Almost surely, 2^28780045 is an apocalyptic number.

It is an amenable number.

28780045 is a deficient number, since it is larger than the sum of its proper divisors (10997363).

28780045 is a wasteful number, since it uses less digits than its factorization.

28780045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6420.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28780045 is about 5364.7036264830. The cubic root of 28780045 is about 306.4529616710.

The spelling of 28780045 in words is "twenty-eight million, seven hundred eighty thousand, forty-five".