1222445778 has 16 divisors (see below), whose sum is σ = 2445670560. Its totient is φ = 407352096.

The previous prime is 1222445771. The next prime is 1222445779. The reversal of 1222445778 is 8775442221.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1222445771) 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, 10963 + ... + 50646.

It is an arithmetic number, because the mean of its divisors is an integer number (152854410).

Almost surely, 2^1222445778 is an apocalyptic number.

1222445778 is an abundant number, since it is smaller than the sum of its proper divisors (1223224782).

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

1222445778 is a wasteful number, since it uses less digits than its factorization.

1222445778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64921.

The product of its digits is 250880, while the sum is 42.

The square root of 1222445778 is about 34963.4920738761. The cubic root of 1222445778 is about 1069.2432935547.

Adding to 1222445778 its reverse (8775442221), we get a palindrome (9997887999).

The spelling of 1222445778 in words is "one billion, two hundred twenty-two million, four hundred forty-five thousand, seven hundred seventy-eight".