15728045 has 4 divisors (see below), whose sum is σ = 18873660. Its totient is φ = 12582432.

The previous prime is 15728039. The next prime is 15728047. The reversal of 15728045 is 54082751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54082751 = 457 ⋅118343.

It can be written as a sum of positive squares in 2 ways, for example, as 12033961 + 3694084 = 3469^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 15728045 - 2¹⁶ = 15662509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15728047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1572800 + ... + 1572809.

It is an arithmetic number, because the mean of its divisors is an integer number (4718415).

Almost surely, 2^15728045 is an apocalyptic number.

It is an amenable number.

15728045 is a deficient number, since it is larger than the sum of its proper divisors (3145615).

15728045 is an equidigital number, since it uses as much as digits as its factorization.

15728045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145614.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 15728045 is about 3965.8599319694. The cubic root of 15728045 is about 250.5483696169.

The spelling of 15728045 in words is "fifteen million, seven hundred twenty-eight thousand, forty-five".