28330775 has 24 divisors (see below), whose sum is σ = 38890368. Its totient is φ = 20300000.

The previous prime is 28330769. The next prime is 28330777. The reversal of 28330775 is 57703382.

It is a de Polignac number, because none of the positive numbers 2^k-28330775 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28330777) 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, 18800 + ... + 20250.

It is an arithmetic number, because the mean of its divisors is an integer number (1620432).

Almost surely, 2^28330775 is an apocalyptic number.

28330775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28330775 is a deficient number, since it is larger than the sum of its proper divisors (10559593).

28330775 is a wasteful number, since it uses less digits than its factorization.

28330775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 28330775 is about 5322.6661552271. Note that the first 3 decimals coincide. The cubic root of 28330775 is about 304.8499665204.

It can be divided in two parts, 283307 and 75, that added together give a palindrome (283382).

The spelling of 28330775 in words is "twenty-eight million, three hundred thirty thousand, seven hundred seventy-five".