728623378785 has 32 divisors (see below), whose sum is σ = 1167752498688. Its totient is φ = 387947992320.

The previous prime is 728623378757. The next prime is 728623378789. The reversal of 728623378785 is 587873326827.

It is not a de Polignac number, because 728623378785 - 2⁵ = 728623378753 is a prime.

It is a super-2 number, since 2×728623378785² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728623378789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22630959 + ... + 22663131.

It is an arithmetic number, because the mean of its divisors is an integer number (36492265584).

Almost surely, 2^728623378785 is an apocalyptic number.

It is an amenable number.

728623378785 is a deficient number, since it is larger than the sum of its proper divisors (439129119903).

728623378785 is a wasteful number, since it uses less digits than its factorization.

728623378785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34665.

The product of its digits is 189665280, while the sum is 66.

The spelling of 728623378785 in words is "seven hundred twenty-eight billion, six hundred twenty-three million, three hundred seventy-eight thousand, seven hundred eighty-five".