222778 has 16 divisors (see below), whose sum is σ = 362880. Its totient is φ = 102256.

The previous prime is 222773. The next prime is 222779. The reversal of 222778 is 877222.

222778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

222778 is a nontrivial binomial coefficient, being equal to C(668, 2).

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (222773) 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, 1251 + ... + 1417.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2²²²⁷⁷⁸ is an apocalyptic number.

222778 is the 667-th triangular number and also the 334-th hexagonal number.

222778 is the 223-rd centered nonagonal number.

222778 is a deficient number, since it is larger than the sum of its proper divisors (140102).

222778 is a wasteful number, since it uses less digits than its factorization.

222778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221.

The product of its digits is 3136, while the sum is 28.

The square root of 222778 is about 471.9936440250. The cubic root of 222778 is about 60.6211401517.

It can be divided in two parts, 222 and 778, that added together give a cube (1000 = 10³).

The spelling of 222778 in words is "two hundred twenty-two thousand, seven hundred seventy-eight".