728730145 has 32 divisors (see below), whose sum is σ = 1029417984. Its totient is φ = 488236800.

The previous prime is 728730097. The next prime is 728730169. The reversal of 728730145 is 541037827.

728730145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728730145 - 2²⁷ = 594512417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 616455 + ... + 617635.

It is an arithmetic number, because the mean of its divisors is an integer number (32169312).

Almost surely, 2^728730145 is an apocalyptic number.

It is an amenable number.

728730145 is a deficient number, since it is larger than the sum of its proper divisors (300687839).

728730145 is a wasteful number, since it uses less digits than its factorization.

728730145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 728730145 is about 26995.0022226337. The cubic root of 728730145 is about 899.8889348542. Note that the first 3 decimals are identical.

The spelling of 728730145 in words is "seven hundred twenty-eight million, seven hundred thirty thousand, one hundred forty-five".