140728287 has 8 divisors (see below), whose sum is σ = 214443136. Its totient is φ = 80416152.

The previous prime is 140728267. The next prime is 140728321. The reversal of 140728287 is 782827041.

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

It is not a de Polignac number, because 140728287 - 2¹² = 140724191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140728267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3350653 + ... + 3350694.

It is an arithmetic number, because the mean of its divisors is an integer number (26805392).

Almost surely, 2^140728287 is an apocalyptic number.

140728287 is a deficient number, since it is larger than the sum of its proper divisors (73714849).

140728287 is an equidigital number, since it uses as much as digits as its factorization.

140728287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6701357.

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 140728287 is about 11862.8953885635. The cubic root of 140728287 is about 520.1482405268.

The spelling of 140728287 in words is "one hundred forty million, seven hundred twenty-eight thousand, two hundred eighty-seven".