820449275 has 12 divisors (see below), whose sum is σ = 1036554192. Its totient is φ = 643974240.

The previous prime is 820449271. The next prime is 820449283. The reversal of 820449275 is 572944028.

It is not a de Polignac number, because 820449275 - 2² = 820449271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820449271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308279 + ... + 310928.

It is an arithmetic number, because the mean of its divisors is an integer number (86379516).

Almost surely, 2^820449275 is an apocalyptic number.

820449275 is a deficient number, since it is larger than the sum of its proper divisors (216104917).

820449275 is a wasteful number, since it uses less digits than its factorization.

820449275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619270 (or 619265 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 820449275 is about 28643.4857341072. The cubic root of 820449275 is about 936.1610729660.

It can be divided in two parts, 82044 and 9275, that added together give a palindrome (91319).

The spelling of 820449275 in words is "eight hundred twenty million, four hundred forty-nine thousand, two hundred seventy-five".