728888961 has 8 divisors (see below), whose sum is σ = 972343264. Its totient is φ = 485680320.

The previous prime is 728888959. The next prime is 728888977. The reversal of 728888961 is 169888827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728888961 - 2¹ = 728888959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728888921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54376 + ... + 66441.

It is an arithmetic number, because the mean of its divisors is an integer number (121542908).

Almost surely, 2^728888961 is an apocalyptic number.

It is an amenable number.

728888961 is a deficient number, since it is larger than the sum of its proper divisors (243454303).

728888961 is a wasteful number, since it uses less digits than its factorization.

728888961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122831.

The product of its digits is 3096576, while the sum is 57.

The square root of 728888961 is about 26997.9436439148. The cubic root of 728888961 is about 899.9543026180.

The spelling of 728888961 in words is "seven hundred twenty-eight million, eight hundred eighty-eight thousand, nine hundred sixty-one".