820728546068 has 12 divisors (see below), whose sum is σ = 1436789953620. Its totient is φ = 410217130752.

The previous prime is 820728546041. The next prime is 820728546083. The reversal of 820728546068 is 860645827028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 693659111044 + 127069435024 = 832862^2 + 356468^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36773021 + ... + 36795332.

It is an arithmetic number, because the mean of its divisors is an integer number (119732496135).

Almost surely, 2^820728546068 is an apocalyptic number.

It is an amenable number.

820728546068 is a deficient number, since it is larger than the sum of its proper divisors (616061407552).

820728546068 is a wasteful number, since it uses less digits than its factorization.

820728546068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73571146 (or 73571144 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 56.

The spelling of 820728546068 in words is "eight hundred twenty billion, seven hundred twenty-eight million, five hundred forty-six thousand, sixty-eight".