28715005 has 16 divisors (see below), whose sum is σ = 38232000. Its totient is φ = 20527360.

The previous prime is 28715003. The next prime is 28715009. The reversal of 28715005 is 50051782.

It is not a de Polignac number, because 28715005 - 2¹ = 28715003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715003) 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 15 ways as a sum of consecutive naturals, for example, 1180 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (2389500).

Almost surely, 2^28715005 is an apocalyptic number.

It is an amenable number.

28715005 is a deficient number, since it is larger than the sum of its proper divisors (9516995).

28715005 is a wasteful number, since it uses less digits than its factorization.

28715005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8924.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 28715005 is about 5358.6383531640. The cubic root of 28715005 is about 306.2219366205.

Adding to 28715005 its reverse (50051782), we get a palindrome (78766787).

The spelling of 28715005 in words is "twenty-eight million, seven hundred fifteen thousand, five".