728646251685 has 16 divisors (see below), whose sum is σ = 1271818912320. Its totient is φ = 353283031040.

The previous prime is 728646251657. The next prime is 728646251713. The reversal of 728646251685 is 586152646827.

It is an interprime number because it is at equal distance from previous prime (728646251657) and next prime (728646251713).

It is not a de Polignac number, because 728646251685 - 2⁸ = 728646251429 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2208018780 + ... + 2208019109.

It is an arithmetic number, because the mean of its divisors is an integer number (79488682020).

Almost surely, 2^728646251685 is an apocalyptic number.

It is an amenable number.

728646251685 is a deficient number, since it is larger than the sum of its proper divisors (543172660635).

728646251685 is a wasteful number, since it uses less digits than its factorization.

728646251685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416037908.

The product of its digits is 38707200, while the sum is 60.

The spelling of 728646251685 in words is "seven hundred twenty-eight billion, six hundred forty-six million, two hundred fifty-one thousand, six hundred eighty-five".