222778145 has 8 divisors (see below), whose sum is σ = 276552360. Its totient is φ = 172076800.

The previous prime is 222778139. The next prime is 222778151. The reversal of 222778145 is 541877222.

It is an interprime number because it is at equal distance from previous prime (222778139) and next prime (222778151).

It can be written as a sum of positive squares in 4 ways, for example, as 25684624 + 197093521 = 5068^2 + 14039^2 .

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

It is not a de Polignac number, because 222778145 - 2²⁴ = 206000929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222778099 and 222778108.

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 7 ways as a sum of consecutive naturals, for example, 768056 + ... + 768345.

It is an arithmetic number, because the mean of its divisors is an integer number (34569045).

Almost surely, 2^222778145 is an apocalyptic number.

It is an amenable number.

222778145 is a deficient number, since it is larger than the sum of its proper divisors (53774215).

222778145 is a wasteful number, since it uses less digits than its factorization.

222778145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536435.

The product of its digits is 62720, while the sum is 38.

The square root of 222778145 is about 14925.7544197940. The cubic root of 222778145 is about 606.2115330395.

The spelling of 222778145 in words is "two hundred twenty-two million, seven hundred seventy-eight thousand, one hundred forty-five".