128000728 has 16 divisors (see below), whose sum is σ = 240251760. Its totient is φ = 63933600.

The previous prime is 128000711. The next prime is 128000749. The reversal of 128000728 is 827000821.

128000728 is a modest number, since divided by 728 gives 128 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 128000696 and 128000705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333 + ... + 16003.

It is an arithmetic number, because the mean of its divisors is an integer number (15015735).

Almost surely, 2^128000728 is an apocalyptic number.

It is an amenable number.

128000728 is a deficient number, since it is larger than the sum of its proper divisors (112251032).

128000728 is a wasteful number, since it uses less digits than its factorization.

128000728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16698 (or 16694 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 128000728 is about 11313.7406722976. The cubic root of 128000728 is about 503.9693753963.

The spelling of 128000728 in words is "one hundred twenty-eight million, seven hundred twenty-eight", and thus it is an aban number.