728699710221 has 12 divisors (see below), whose sum is σ = 1202932855072. Its totient is φ = 416399834376.

The previous prime is 728699710181. The next prime is 728699710237. The reversal of 728699710221 is 122017996827.

728699710221 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 728699710221 - 2⁹ = 728699709709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728699710241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5783330971 + ... + 5783331096.

Almost surely, 2^728699710221 is an apocalyptic number.

It is an amenable number.

728699710221 is a deficient number, since it is larger than the sum of its proper divisors (474233144851).

728699710221 is a wasteful number, since it uses less digits than its factorization.

728699710221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11566662080 (or 11566662077 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 728699710221 in words is "seven hundred twenty-eight billion, six hundred ninety-nine million, seven hundred ten thousand, two hundred twenty-one".