28563375 has 32 divisors (see below), whose sum is σ = 48372480. Its totient is φ = 14964000.

The previous prime is 28563361. The next prime is 28563377. The reversal of 28563375 is 57336582.

It is not a de Polignac number, because 28563375 - 2¹¹ = 28561327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28563377) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21480 + ... + 22770.

It is an arithmetic number, because the mean of its divisors is an integer number (1511640).

Almost surely, 2^28563375 is an apocalyptic number.

28563375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28563375 is a deficient number, since it is larger than the sum of its proper divisors (19809105).

28563375 is a wasteful number, since it uses less digits than its factorization.

28563375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1358 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The square root of 28563375 is about 5344.4714425283. The cubic root of 28563375 is about 305.6819819649.

The spelling of 28563375 in words is "twenty-eight million, five hundred sixty-three thousand, three hundred seventy-five".