218029530 has 64 divisors (see below), whose sum is σ = 543697920. Its totient is φ = 55908864.

The previous prime is 218029529. The next prime is 218029543. The reversal of 218029530 is 35920812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97687 + ... + 99893.

It is an arithmetic number, because the mean of its divisors is an integer number (8495280).

Almost surely, 2^218029530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218029530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271848960).

218029530 is an abundant number, since it is smaller than the sum of its proper divisors (325668390).

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

218029530 is a wasteful number, since it uses less digits than its factorization.

218029530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 218029530 is about 14765.8230383545. The cubic root of 218029530 is about 601.8733393566.

The spelling of 218029530 in words is "two hundred eighteen million, twenty-nine thousand, five hundred thirty".