28381375 has 16 divisors (see below), whose sum is σ = 38641824. Its totient is φ = 20640000.

The previous prime is 28381351. The next prime is 28381403. The reversal of 28381375 is 57318382.

It is not a de Polignac number, because 28381375 - 2¹⁷ = 28250303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8946 + ... + 11695.

It is an arithmetic number, because the mean of its divisors is an integer number (2415114).

Almost surely, 2^28381375 is an apocalyptic number.

28381375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28381375 is a deficient number, since it is larger than the sum of its proper divisors (10260449).

28381375 is a wasteful number, since it uses less digits than its factorization.

28381375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20667 (or 20657 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 28381375 is about 5327.4172917090. The cubic root of 28381375 is about 305.0313503562.

The spelling of 28381375 in words is "twenty-eight million, three hundred eighty-one thousand, three hundred seventy-five".