28231375 has 16 divisors (see below), whose sum is σ = 35740224. Its totient is φ = 22260000.

The previous prime is 28231289. The next prime is 28231387. The reversal of 28231375 is 57313282.

It is not a de Polignac number, because 28231375 - 2¹³ = 28223183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7285 + ... + 10465.

It is an arithmetic number, because the mean of its divisors is an integer number (2233764).

Almost surely, 2^28231375 is an apocalyptic number.

28231375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28231375 is a deficient number, since it is larger than the sum of its proper divisors (7508849).

28231375 is an equidigital number, since it uses as much as digits as its factorization.

28231375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267 (or 3257 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 28231375 is about 5313.3205248695. The cubic root of 28231375 is about 304.4930214112.

The spelling of 28231375 in words is "twenty-eight million, two hundred thirty-one thousand, three hundred seventy-five".