2118728287 has 4 divisors (see below), whose sum is σ = 2281707400. Its totient is φ = 1955749176.

The previous prime is 2118728273. The next prime is 2118728317. The reversal of 2118728287 is 7828278112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2118728287 - 2¹⁵ = 2118695519 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 (2118728267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81489537 + ... + 81489562.

It is an arithmetic number, because the mean of its divisors is an integer number (570426850).

Almost surely, 2^2118728287 is an apocalyptic number.

2118728287 is a deficient number, since it is larger than the sum of its proper divisors (162979113).

2118728287 is a wasteful number, since it uses less digits than its factorization.

2118728287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162979112.

The product of its digits is 200704, while the sum is 46.

The square root of 2118728287 is about 46029.6457405442. The cubic root of 2118728287 is about 1284.3747379717.

The spelling of 2118728287 in words is "two billion, one hundred eighteen million, seven hundred twenty-eight thousand, two hundred eighty-seven".