218616428 has 12 divisors (see below), whose sum is σ = 391910232. Its totient is φ = 106642080.

The previous prime is 218616427. The next prime is 218616457. The reversal of 218616428 is 824616812.

It is a happy number.

218616428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 218616391 and 218616400.

It is not an unprimeable number, because it can be changed into a prime (218616421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666350 + ... + 666677.

It is an arithmetic number, because the mean of its divisors is an integer number (32659186).

Almost surely, 2^218616428 is an apocalyptic number.

It is an amenable number.

218616428 is a deficient number, since it is larger than the sum of its proper divisors (173293804).

218616428 is a wasteful number, since it uses less digits than its factorization.

218616428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333072 (or 1333070 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 218616428 is about 14785.6832104573. The cubic root of 218616428 is about 602.4129020174.

The spelling of 218616428 in words is "two hundred eighteen million, six hundred sixteen thousand, four hundred twenty-eight".