820162775 has 12 divisors (see below), whose sum is σ = 1052071800. Its totient is φ = 633504480.

The previous prime is 820162741. The next prime is 820162787. The reversal of 820162775 is 577261028.

820162775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 820162775 - 2¹⁰ = 820161751 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 564905 + ... + 566354.

It is an arithmetic number, because the mean of its divisors is an integer number (87672650).

Almost surely, 2^820162775 is an apocalyptic number.

820162775 is a deficient number, since it is larger than the sum of its proper divisors (231909025).

820162775 is a wasteful number, since it uses less digits than its factorization.

820162775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131298 (or 1131293 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 820162775 is about 28638.4841603043. The cubic root of 820162775 is about 936.0520914680.

The spelling of 820162775 in words is "eight hundred twenty million, one hundred sixty-two thousand, seven hundred seventy-five".