140728289 has 8 divisors (see below), whose sum is σ = 151651752. Its totient is φ = 129818880.

The previous prime is 140728267. The next prime is 140728321. The reversal of 140728289 is 982827041.

140728289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1677025 + 139051264 = 1295^2 + 11792^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140728289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140728589) 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, 27449 + ... + 32169.

It is an arithmetic number, because the mean of its divisors is an integer number (18956469).

Almost surely, 2^140728289 is an apocalyptic number.

It is an amenable number.

140728289 is a deficient number, since it is larger than the sum of its proper divisors (10923463).

140728289 is a wasteful number, since it uses less digits than its factorization.

140728289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 140728289 is about 11862.8954728599. The cubic root of 140728289 is about 520.1482429909.

The spelling of 140728289 in words is "one hundred forty million, seven hundred twenty-eight thousand, two hundred eighty-nine".