728220821822 has 8 divisors (see below), whose sum is σ = 1176356712216. Its totient is φ = 336101917752.

The previous prime is 728220821791. The next prime is 728220821837. The reversal of 728220821822 is 228128022827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×728220821822³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14004246548 + ... + 14004246599.

It is an arithmetic number, because the mean of its divisors is an integer number (147044589027).

Almost surely, 2^728220821822 is an apocalyptic number.

728220821822 is a deficient number, since it is larger than the sum of its proper divisors (448135890394).

728220821822 is a wasteful number, since it uses less digits than its factorization.

728220821822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28008493162.

The product of its (nonzero) digits is 229376, while the sum is 44.

The spelling of 728220821822 in words is "seven hundred twenty-eight billion, two hundred twenty million, eight hundred twenty-one thousand, eight hundred twenty-two".