28275075 has 30 divisors (see below), whose sum is σ = 52378964. Its totient is φ = 15078960.

The previous prime is 28275061. The next prime is 28275077. The reversal of 28275075 is 57057282.

It is not a de Polignac number, because 28275075 - 2⁵ = 28275043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28275077) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4957 + ... + 9006.

Almost surely, 2^28275075 is an apocalyptic number.

28275075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28275075 is a deficient number, since it is larger than the sum of its proper divisors (24103889).

28275075 is a wasteful number, since it uses less digits than its factorization.

28275075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13985 (or 13971 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 28275075 is about 5317.4312407402. The cubic root of 28275075 is about 304.6500510187.

It can be divided in two parts, 282 and 75075, that added together give a palindrome (75357).

The spelling of 28275075 in words is "twenty-eight million, two hundred seventy-five thousand, seventy-five".