28727945 has 8 divisors (see below), whose sum is σ = 34705800. Its totient is φ = 22827520.

The previous prime is 28727927. The next prime is 28727953. The reversal of 28727945 is 54972782.

It can be written as a sum of positive squares in 4 ways, for example, as 41209 + 28686736 = 203^2 + 5356^2 .

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

It is not a de Polignac number, because 28727945 - 2⁸ = 28727689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28727896 and 28727905.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18536 + ... + 20025.

It is an arithmetic number, because the mean of its divisors is an integer number (4338225).

Almost surely, 2^28727945 is an apocalyptic number.

It is an amenable number.

28727945 is a deficient number, since it is larger than the sum of its proper divisors (5977855).

28727945 is a wasteful number, since it uses less digits than its factorization.

28727945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38715.

The product of its digits is 282240, while the sum is 44.

The square root of 28727945 is about 5359.8456134482. The cubic root of 28727945 is about 306.2679278690.

The spelling of 28727945 in words is "twenty-eight million, seven hundred twenty-seven thousand, nine hundred forty-five".