728625751866 has 16 divisors (see below), whose sum is σ = 1619168337600. Its totient is φ = 242875250604.

The previous prime is 728625751813. The next prime is 728625751871. The reversal of 728625751866 is 668157526827.

728625751866 is a `hidden beast` number, since 7 + 2 + 8 + 6 + 2 + 57 + 518 + 66 = 666.

It is a Curzon 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, 6746534686 + ... + 6746534793.

It is an arithmetic number, because the mean of its divisors is an integer number (101198021100).

Almost surely, 2^728625751866 is an apocalyptic number.

728625751866 is an abundant number, since it is smaller than the sum of its proper divisors (890542585734).

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

728625751866 is a wasteful number, since it uses less digits than its factorization.

728625751866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13493069490 (or 13493069484 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 63.

The spelling of 728625751866 in words is "seven hundred twenty-eight billion, six hundred twenty-five million, seven hundred fifty-one thousand, eight hundred sixty-six".