728243885218 has 4 divisors (see below), whose sum is σ = 1092365827830. Its totient is φ = 364121942608.

The previous prime is 728243885207. The next prime is 728243885293. The reversal of 728243885218 is 812588342827.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 710165200369 + 18078684849 = 842713^2 + 134457^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182060971303 + ... + 182060971306.

Almost surely, 2^728243885218 is an apocalyptic number.

728243885218 is a deficient number, since it is larger than the sum of its proper divisors (364121942612).

728243885218 is a wasteful number, since it uses less digits than its factorization.

728243885218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364121942611.

The product of its digits is 13762560, while the sum is 58.

The spelling of 728243885218 in words is "seven hundred twenty-eight billion, two hundred forty-three million, eight hundred eighty-five thousand, two hundred eighteen".