28715903 has 4 divisors (see below), whose sum is σ = 28730520. Its totient is φ = 28701288.

The previous prime is 28715849. The next prime is 28715909. The reversal of 28715903 is 30951782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30951782 = 2 ⋅15475891.

It is a cyclic number.

It is not a de Polignac number, because 28715903 - 2⁸ = 28715647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3800 + ... + 8477.

It is an arithmetic number, because the mean of its divisors is an integer number (7182630).

Almost surely, 2^28715903 is an apocalyptic number.

28715903 is a deficient number, since it is larger than the sum of its proper divisors (14617).

28715903 is a wasteful number, since it uses less digits than its factorization.

28715903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14616.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28715903 is about 5358.7221424515. The cubic root of 28715903 is about 306.2251287313.

The spelling of 28715903 in words is "twenty-eight million, seven hundred fifteen thousand, nine hundred three".