28715485 has 4 divisors (see below), whose sum is σ = 34458588. Its totient is φ = 22972384.

The previous prime is 28715471. The next prime is 28715503. The reversal of 28715485 is 58451782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58451782 = 2 ⋅29225891.

It can be written as a sum of positive squares in 2 ways, for example, as 12020089 + 16695396 = 3467^2 + 4086^2 .

It is a cyclic number.

It is not a de Polignac number, because 28715485 - 2¹¹ = 28713437 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871544 + ... + 2871553.

It is an arithmetic number, because the mean of its divisors is an integer number (8614647).

Almost surely, 2^28715485 is an apocalyptic number.

It is an amenable number.

28715485 is a deficient number, since it is larger than the sum of its proper divisors (5743103).

28715485 is an equidigital number, since it uses as much as digits as its factorization.

28715485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5743102.

The product of its digits is 89600, while the sum is 40.

The square root of 28715485 is about 5358.6831404740. The cubic root of 28715485 is about 306.2236428795.

The spelling of 28715485 in words is "twenty-eight million, seven hundred fifteen thousand, four hundred eighty-five".