820135108 has 12 divisors (see below), whose sum is σ = 1545639340. Its totient is φ = 378523872.

The previous prime is 820135079. The next prime is 820135111. The reversal of 820135108 is 801531028.

It can be written as a sum of positive squares in 2 ways, for example, as 121484484 + 698650624 = 11022^2 + 26432^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7885863 + ... + 7885966.

Almost surely, 2^820135108 is an apocalyptic number.

It is an amenable number.

820135108 is a deficient number, since it is larger than the sum of its proper divisors (725504232).

820135108 is a wasteful number, since it uses less digits than its factorization.

820135108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15771846 (or 15771844 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 820135108 is about 28638.0011173964. The cubic root of 820135108 is about 936.0415658971.

The spelling of 820135108 in words is "eight hundred twenty million, one hundred thirty-five thousand, one hundred eight".