728945308799 has 4 divisors (see below), whose sum is σ = 754081353960. Its totient is φ = 703809263640.

The previous prime is 728945308727. The next prime is 728945308829. The reversal of 728945308799 is 997803549827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728945308799 - 2²⁰ = 728944260223 is a prime.

It is a super-2 number, since 2×728945308799² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728945304799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12568022537 + ... + 12568022594.

It is an arithmetic number, because the mean of its divisors is an integer number (188520338490).

Almost surely, 2^728945308799 is an apocalyptic number.

728945308799 is a deficient number, since it is larger than the sum of its proper divisors (25136045161).

728945308799 is a wasteful number, since it uses less digits than its factorization.

728945308799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25136045160.

The product of its (nonzero) digits is 274337280, while the sum is 71.

The spelling of 728945308799 in words is "seven hundred twenty-eight billion, nine hundred forty-five million, three hundred eight thousand, seven hundred ninety-nine".