28784545 has 8 divisors (see below), whose sum is σ = 34581096. Its totient is φ = 23001216.

The previous prime is 28784543. The next prime is 28784549. The reversal of 28784545 is 54548782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3069504 + 25715041 = 1752^2 + 5071^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28784545 - 2¹ = 28784543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28784543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2379 + ... + 7951.

It is an arithmetic number, because the mean of its divisors is an integer number (4322637).

Almost surely, 2^28784545 is an apocalyptic number.

It is an amenable number.

28784545 is a deficient number, since it is larger than the sum of its proper divisors (5796551).

28784545 is a wasteful number, since it uses less digits than its factorization.

28784545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6611.

The product of its digits is 358400, while the sum is 43.

The square root of 28784545 is about 5365.1230181609. The cubic root of 28784545 is about 306.4689329972.

The spelling of 28784545 in words is "twenty-eight million, seven hundred eighty-four thousand, five hundred forty-five".