728607697667 has 4 divisors (see below), whose sum is σ = 728676077256. Its totient is φ = 728539318080.

The previous prime is 728607697663. The next prime is 728607697711. The reversal of 728607697667 is 766796706827.

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 728607697667 - 2² = 728607697663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728607697667.

It is not an unprimeable number, because it can be changed into a prime (728607697663) 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, 34173809 + ... + 34195122.

It is an arithmetic number, because the mean of its divisors is an integer number (182169019314).

Almost surely, 2^728607697667 is an apocalyptic number.

728607697667 is a deficient number, since it is larger than the sum of its proper divisors (68379589).

728607697667 is a wasteful number, since it uses less digits than its factorization.

728607697667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68379588.

The product of its (nonzero) digits is 448084224, while the sum is 71.

The spelling of 728607697667 in words is "seven hundred twenty-eight billion, six hundred seven million, six hundred ninety-seven thousand, six hundred sixty-seven".