28344975 has 24 divisors (see below), whose sum is σ = 47532672. Its totient is φ = 14901600.

The previous prime is 28344961. The next prime is 28344989. The reversal of 28344975 is 57944382.

It is a Cunningham number, because it is equal to 5324²-1.

It is an interprime number because it is at equal distance from previous prime (28344961) and next prime (28344989).

It is not a de Polignac number, because 28344975 - 2¹⁴ = 28328591 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2664 + ... + 7986.

It is an arithmetic number, because the mean of its divisors is an integer number (1980528).

Almost surely, 2^28344975 is an apocalyptic number.

28344975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28344975 is a deficient number, since it is larger than the sum of its proper divisors (19187697).

28344975 is a wasteful number, since it uses less digits than its factorization.

28344975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407 (or 5402 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 28344975 is about 5323.9999060856. Note that the first 4 decimals coincide. The cubic root of 28344975 is about 304.9008904890.

The spelling of 28344975 in words is "twenty-eight million, three hundred forty-four thousand, nine hundred seventy-five".