222776778 has 32 divisors (see below), whose sum is σ = 522969984. Its totient is φ = 61929792.

The previous prime is 222776737. The next prime is 222776833. The reversal of 222776778 is 877677222.

222776778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×222776778² = 99258985632122568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70125 + ... + 73232.

It is an arithmetic number, because the mean of its divisors is an integer number (16342812).

Almost surely, 2^222776778 is an apocalyptic number.

222776778 is an abundant number, since it is smaller than the sum of its proper divisors (300193206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222776778 is a wasteful number, since it uses less digits than its factorization.

222776778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143406.

The product of its digits is 921984, while the sum is 48.

The square root of 222776778 is about 14925.7086263936. The cubic root of 222776778 is about 606.2102931021.

The spelling of 222776778 in words is "two hundred twenty-two million, seven hundred seventy-six thousand, seven hundred seventy-eight".