722222778 has 16 divisors (see below), whose sum is σ = 1445004000. Its totient is φ = 240647856.

The previous prime is 722222771. The next prime is 722222789. The reversal of 722222778 is 877222227.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (722222771) 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, 5400 + ... + 38387.

It is an arithmetic number, because the mean of its divisors is an integer number (90312750).

Almost surely, 2^722222778 is an apocalyptic number.

722222778 is an abundant number, since it is smaller than the sum of its proper divisors (722781222).

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

722222778 is a wasteful number, since it uses less digits than its factorization.

722222778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46541.

The product of its digits is 87808, while the sum is 39.

The square root of 722222778 is about 26874.2028346889. The cubic root of 722222778 is about 897.2023321583.

The spelling of 722222778 in words is "seven hundred twenty-two million, two hundred twenty-two thousand, seven hundred seventy-eight".