820949317696 has 28 divisors (see below), whose sum is σ = 1655777397100. Its totient is φ = 403745564160.

The previous prime is 820949317681. The next prime is 820949317709. The reversal of 820949317696 is 696713949028.

It can be written as a sum of positive squares in 2 ways, for example, as 391295287296 + 429654030400 = 625536^2 + 655480^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105138171 + ... + 105145978.

Almost surely, 2^820949317696 is an apocalyptic number.

It is an amenable number.

820949317696 is an abundant number, since it is smaller than the sum of its proper divisors (834828079404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820949317696 is a wasteful number, since it uses less digits than its factorization.

820949317696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210284222 (or 210284212 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 820949317696 in words is "eight hundred twenty billion, nine hundred forty-nine million, three hundred seventeen thousand, six hundred ninety-six".