218860745 has 8 divisors (see below), whose sum is σ = 263531016. Its totient is φ = 174489856.

The previous prime is 218860739. The next prime is 218860757. The reversal of 218860745 is 547068812.

It can be written as a sum of positive squares in 4 ways, for example, as 124634896 + 94225849 = 11164^2 + 9707^2 .

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-218860745 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73232 + ... + 76161.

It is an arithmetic number, because the mean of its divisors is an integer number (32941377).

Almost surely, 2^218860745 is an apocalyptic number.

It is an amenable number.

218860745 is a deficient number, since it is larger than the sum of its proper divisors (44670271).

218860745 is a wasteful number, since it uses less digits than its factorization.

218860745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149691.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 218860745 is about 14793.9428483417. The cubic root of 218860745 is about 602.6372293487.

The spelling of 218860745 in words is "two hundred eighteen million, eight hundred sixty thousand, seven hundred forty-five".