28717975 has 48 divisors (see below), whose sum is σ = 43434720. Its totient is φ = 18547200.

The previous prime is 28717973. The next prime is 28717993. The reversal of 28717975 is 57971782.

It is not a de Polignac number, because 28717975 - 2¹ = 28717973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717973) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 103537 + ... + 103813.

It is an arithmetic number, because the mean of its divisors is an integer number (904890).

Almost surely, 2^28717975 is an apocalyptic number.

28717975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28717975 is a deficient number, since it is larger than the sum of its proper divisors (14716745).

28717975 is a wasteful number, since it uses less digits than its factorization.

28717975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 335 counting only the distinct ones).

The product of its digits is 246960, while the sum is 46.

The square root of 28717975 is about 5358.9154686373. The cubic root of 28717975 is about 306.2324937931.

It can be divided in two parts, 28717 and 975, that added together give a palindrome (29692).

The spelling of 28717975 in words is "twenty-eight million, seven hundred seventeen thousand, nine hundred seventy-five".