218628447 has 8 divisors (see below), whose sum is σ = 292086144. Its totient is φ = 145461528.

The previous prime is 218628439. The next prime is 218628457. The reversal of 218628447 is 744826812.

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

It is not a de Polignac number, because 218628447 - 2³ = 218628439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218628399 and 218628408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218628407) 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, 70933 + ... + 73950.

It is an arithmetic number, because the mean of its divisors is an integer number (36510768).

Almost surely, 2^218628447 is an apocalyptic number.

218628447 is a deficient number, since it is larger than the sum of its proper divisors (73457697).

218628447 is a wasteful number, since it uses less digits than its factorization.

218628447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145389.

The product of its digits is 172032, while the sum is 42.

The square root of 218628447 is about 14786.0896453390. The cubic root of 218628447 is about 602.4239415476.

The spelling of 218628447 in words is "two hundred eighteen million, six hundred twenty-eight thousand, four hundred forty-seven".