28156875 has 20 divisors (see below), whose sum is σ = 46916232. Its totient is φ = 15016000.

The previous prime is 28156871. The next prime is 28156927. The reversal of 28156875 is 57865182.

It is not a de Polignac number, because 28156875 - 2² = 28156871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28156871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5634 + ... + 9383.

Almost surely, 2^28156875 is an apocalyptic number.

28156875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28156875 is a deficient number, since it is larger than the sum of its proper divisors (18759357).

28156875 is an equidigital number, since it uses as much as digits as its factorization.

28156875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15040 (or 15025 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 28156875 is about 5306.3052117269. The cubic root of 28156875 is about 304.2249424423.

The spelling of 28156875 in words is "twenty-eight million, one hundred fifty-six thousand, eight hundred seventy-five".