728018406405 has 24 divisors (see below), whose sum is σ = 1262025453312. Its totient is φ = 388237442784.

The previous prime is 728018406403. The next prime is 728018406433. The reversal of 728018406405 is 504604810827.

It is not a de Polignac number, because 728018406405 - 2¹ = 728018406403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728018406403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 358029 + ... + 1258658.

It is an arithmetic number, because the mean of its divisors is an integer number (52584393888).

Almost surely, 2^728018406405 is an apocalyptic number.

It is an amenable number.

728018406405 is a deficient number, since it is larger than the sum of its proper divisors (534007046907).

728018406405 is a wasteful number, since it uses less digits than its factorization.

728018406405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626705 (or 1626702 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 728018406405 in words is "seven hundred twenty-eight billion, eighteen million, four hundred six thousand, four hundred five".