218280630 has 16 divisors (see below), whose sum is σ = 523873584. Its totient is φ = 58208160.

The previous prime is 218280613. The next prime is 218280661. The reversal of 218280630 is 36082812.

218280630 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 7276021 = 218280630 / (2 + 1 + 8 + 2 + 8 + 0 + 6 + 3 + 0).

It is a congruent 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, 3637981 + ... + 3638040.

It is an arithmetic number, because the mean of its divisors is an integer number (32742099).

Almost surely, 2^218280630 is an apocalyptic number.

218280630 is an abundant number, since it is smaller than the sum of its proper divisors (305592954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218280630 is a wasteful number, since it uses less digits than its factorization.

218280630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276031.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 218280630 is about 14774.3233347589. The cubic root of 218280630 is about 602.1043056462.

The spelling of 218280630 in words is "two hundred eighteen million, two hundred eighty thousand, six hundred thirty".