820135276 has 12 divisors (see below), whose sum is σ = 1437995160. Its totient is φ = 409279520.

The previous prime is 820135249. The next prime is 820135319. The reversal of 820135276 is 672531028.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194686 + ... + 198853.

It is an arithmetic number, because the mean of its divisors is an integer number (119832930).

Almost surely, 2^820135276 is an apocalyptic number.

It is an amenable number.

820135276 is a deficient number, since it is larger than the sum of its proper divisors (617859884).

820135276 is a wasteful number, since it uses less digits than its factorization.

820135276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394064 (or 394062 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 820135276 is about 28638.0040505619. The cubic root of 820135276 is about 936.0416298113.

The spelling of 820135276 in words is "eight hundred twenty million, one hundred thirty-five thousand, two hundred seventy-six".