218772086 has 8 divisors (see below), whose sum is σ = 353401104. Its totient is φ = 100971720.

The previous prime is 218772077. The next prime is 218772091. The reversal of 218772086 is 680277812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×218772086² = 95722451225582792, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 4207130 + ... + 4207181.

It is an arithmetic number, because the mean of its divisors is an integer number (44175138).

Almost surely, 2^218772086 is an apocalyptic number.

218772086 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

218772086 is a deficient number, since it is larger than the sum of its proper divisors (134629018).

218772086 is a wasteful number, since it uses less digits than its factorization.

218772086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8414326.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 218772086 is about 14790.9460819787. The cubic root of 218772086 is about 602.5558436098. Note that the first 3 decimals are identical.

The spelling of 218772086 in words is "two hundred eighteen million, seven hundred seventy-two thousand, eighty-six".