218778834 has 16 divisors (see below), whose sum is σ = 441648288. Its totient is φ = 72244512.

The previous prime is 218778823. The next prime is 218778839. The reversal of 218778834 is 438877812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (218778839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169747 + ... + 171030.

It is an arithmetic number, because the mean of its divisors is an integer number (27603018).

Almost surely, 2^218778834 is an apocalyptic number.

218778834 is an abundant number, since it is smaller than the sum of its proper divisors (222869454).

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

218778834 is a wasteful number, since it uses less digits than its factorization.

218778834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340889.

The product of its digits is 602112, while the sum is 48.

The square root of 218778834 is about 14791.1741927408. The cubic root of 218778834 is about 602.5620388015.

The spelling of 218778834 in words is "two hundred eighteen million, seven hundred seventy-eight thousand, eight hundred thirty-four".