28071875 has 24 divisors (see below), whose sum is σ = 37841328. Its totient is φ = 20700000.

The previous prime is 28071871. The next prime is 28071877. The reversal of 28071875 is 57817082.

It is not a de Polignac number, because 28071875 - 2² = 28071871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28071871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40280 + ... + 40970.

It is an arithmetic number, because the mean of its divisors is an integer number (1576722).

Almost surely, 2^28071875 is an apocalyptic number.

28071875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28071875 is a deficient number, since it is larger than the sum of its proper divisors (9769453).

28071875 is an frugal number, since it uses more digits than its factorization.

28071875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 28071875 is about 5298.2898184225. The cubic root of 28071875 is about 303.9185023631.

The spelling of 28071875 in words is "twenty-eight million, seventy-one thousand, eight hundred seventy-five".