728896778961 has 32 divisors (see below), whose sum is σ = 1058791668480. Its totient is φ = 443339787264.

The previous prime is 728896778899. The next prime is 728896779041. The reversal of 728896778961 is 169877698827.

It is not a de Polignac number, because 728896778961 - 2⁷ = 728896778833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (728896778861) 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 31 ways as a sum of consecutive naturals, for example, 9203845 + ... + 9282701.

It is an arithmetic number, because the mean of its divisors is an integer number (33087239640).

Almost surely, 2^728896778961 is an apocalyptic number.

It is an amenable number.

728896778961 is a deficient number, since it is larger than the sum of its proper divisors (329894889519).

728896778961 is a wasteful number, since it uses less digits than its factorization.

728896778961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81625.

The product of its digits is 1024192512, while the sum is 78.

The spelling of 728896778961 in words is "seven hundred twenty-eight billion, eight hundred ninety-six million, seven hundred seventy-eight thousand, nine hundred sixty-one".