220778 has 8 divisors (see below), whose sum is σ = 336960. Its totient is φ = 108460.

The previous prime is 220771. The next prime is 220783. The reversal of 220778 is 877022.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220771) by changing a digit.

220778 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 818 + ... + 1053.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2²²⁰⁷⁷⁸ is an apocalyptic number.

220778 is a deficient number, since it is larger than the sum of its proper divisors (116182).

220778 is a wasteful number, since it uses less digits than its factorization.

220778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 220778 is about 469.8701948411. The cubic root of 220778 is about 60.4391848417.

The spelling of 220778 in words is "two hundred twenty thousand, seven hundred seventy-eight".