728787644645 has 8 divisors (see below), whose sum is σ = 920573867040. Its totient is φ = 552344320080.

The previous prime is 728787644617. The next prime is 728787644719. The reversal of 728787644645 is 546446787827.

728787644645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 728787644645 - 2¹² = 728787640549 is a prime.

It is a super-2 number, since 2×728787644645² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3835724351 + ... + 3835724540.

It is an arithmetic number, because the mean of its divisors is an integer number (115071733380).

Almost surely, 2^728787644645 is an apocalyptic number.

It is an amenable number.

728787644645 is a deficient number, since it is larger than the sum of its proper divisors (191786222395).

728787644645 is a wasteful number, since it uses less digits than its factorization.

728787644645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7671448915.

The product of its digits is 505774080, while the sum is 68.

The spelling of 728787644645 in words is "seven hundred twenty-eight billion, seven hundred eighty-seven million, six hundred forty-four thousand, six hundred forty-five".