289657728 has 64 divisors (see below), whose sum is σ = 854902800. Its totient is φ = 96551424.

The previous prime is 289657721. The next prime is 289657729. The reversal of 289657728 is 827756982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289657721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38451 + ... + 45362.

Almost surely, 2^289657728 is an apocalyptic number.

It is an amenable number.

289657728 is an abundant number, since it is smaller than the sum of its proper divisors (565245072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

289657728 is an equidigital number, since it uses as much as digits as its factorization.

289657728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83836 (or 83818 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 289657728 is about 17019.3339470145. Note that the first 3 decimals coincide. The cubic root of 289657728 is about 661.6500860079.

The spelling of 289657728 in words is "two hundred eighty-nine million, six hundred fifty-seven thousand, seven hundred twenty-eight".