218303690 has 32 divisors (see below), whose sum is σ = 438647616. Its totient is φ = 77535360.

The previous prime is 218303671. The next prime is 218303693. The reversal of 218303690 is 96303812.

It is a super-2 number, since 2×218303690² = 95313002135232200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (218303693) 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 15 ways as a sum of consecutive naturals, for example, 18347 + ... + 27806.

It is an arithmetic number, because the mean of its divisors is an integer number (13707738).

Almost surely, 2^218303690 is an apocalyptic number.

218303690 is an abundant number, since it is smaller than the sum of its proper divisors (220343926).

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

218303690 is a wasteful number, since it uses less digits than its factorization.

218303690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46214.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 218303690 is about 14775.1037221402. The cubic root of 218303690 is about 602.1255077662.

The spelling of 218303690 in words is "two hundred eighteen million, three hundred three thousand, six hundred ninety".