728747939178 has 480 divisors, whose sum is σ = 2148103203840. Its totient is φ = 183074411520.

The previous prime is 728747939173. The next prime is 728747939251. The reversal of 728747939178 is 871939747827.

728747939178 is a `hidden beast` number, since 7 + 2 + 87 + 479 + 3 + 9 + 1 + 78 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (728747939173) 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 239 ways as a sum of consecutive naturals, for example, 121313451 + ... + 121319457.

It is an arithmetic number, because the mean of its divisors is an integer number (4475215008).

Almost surely, 2^728747939178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 728747939178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074051601920).

728747939178 is an abundant number, since it is smaller than the sum of its proper divisors (1419355264662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728747939178 is a wasteful number, since it uses less digits than its factorization.

728747939178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6112 (or 6096 counting only the distinct ones).

The product of its digits is 298722816, while the sum is 72.

The spelling of 728747939178 in words is "seven hundred twenty-eight billion, seven hundred forty-seven million, nine hundred thirty-nine thousand, one hundred seventy-eight".