28131375 has 16 divisors (see below), whose sum is σ = 46811232. Its totient is φ = 15003200.

The previous prime is 28131373. The next prime is 28131401. The reversal of 28131375 is 57313182.

It is not a de Polignac number, because 28131375 - 2¹ = 28131373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37134 + ... + 37883.

It is an arithmetic number, because the mean of its divisors is an integer number (2925702).

Almost surely, 2^28131375 is an apocalyptic number.

28131375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28131375 is a deficient number, since it is larger than the sum of its proper divisors (18679857).

28131375 is an equidigital number, since it uses as much as digits as its factorization.

28131375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75035 (or 75025 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 28131375 is about 5303.9018656080. The cubic root of 28131375 is about 304.1330752504.

The spelling of 28131375 in words is "twenty-eight million, one hundred thirty-one thousand, three hundred seventy-five".