28047545 has 8 divisors (see below), whose sum is σ = 33687240. Its totient is φ = 22417920.

The previous prime is 28047541. The next prime is 28047563. The reversal of 28047545 is 54574082.

It can be written as a sum of positive squares in 4 ways, for example, as 5740816 + 22306729 = 2396^2 + 4723^2 .

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

It is not a de Polignac number, because 28047545 - 2² = 28047541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28047541) 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, 6665 + ... + 10025.

It is an arithmetic number, because the mean of its divisors is an integer number (4210905).

Almost surely, 2^28047545 is an apocalyptic number.

It is an amenable number.

28047545 is a deficient number, since it is larger than the sum of its proper divisors (5639695).

28047545 is a wasteful number, since it uses less digits than its factorization.

28047545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035.

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 28047545 is about 5295.9932968236. The cubic root of 28047545 is about 303.8306745470.

The spelling of 28047545 in words is "twenty-eight million, forty-seven thousand, five hundred forty-five".