218828978 has 8 divisors (see below), whose sum is σ = 335877168. Its totient is φ = 106869924.

The previous prime is 218828941. The next prime is 218829007. The reversal of 218828978 is 879828812.

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

It is a super-2 number, since 2×218828978² = 95772243225048968, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1272176 + ... + 1272347.

It is an arithmetic number, because the mean of its divisors is an integer number (41984646).

Almost surely, 2^218828978 is an apocalyptic number.

218828978 is a deficient number, since it is larger than the sum of its proper divisors (117048190).

218828978 is a wasteful number, since it uses less digits than its factorization.

218828978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544568.

The product of its digits is 1032192, while the sum is 53.

The square root of 218828978 is about 14792.8691605111. The cubic root of 218828978 is about 602.6080709247.

The spelling of 218828978 in words is "two hundred eighteen million, eight hundred twenty-eight thousand, nine hundred seventy-eight".