728436889 has 8 divisors (see below), whose sum is σ = 734106240. Its totient is φ = 722790000.

The previous prime is 728436883. The next prime is 728436937. The reversal of 728436889 is 988634827.

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

It is a cyclic number.

It is not a de Polignac number, because 728436889 - 2³ = 728436881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728436881) 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, 62667 + ... + 73375.

It is an arithmetic number, because the mean of its divisors is an integer number (91763280).

Almost surely, 2^728436889 is an apocalyptic number.

It is an amenable number.

728436889 is a deficient number, since it is larger than the sum of its proper divisors (5669351).

728436889 is a wasteful number, since it uses less digits than its factorization.

728436889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11231.

The product of its digits is 4644864, while the sum is 55.

The square root of 728436889 is about 26989.5700039849. The cubic root of 728436889 is about 899.7682073857.

The spelling of 728436889 in words is "seven hundred twenty-eight million, four hundred thirty-six thousand, eight hundred eighty-nine".