1222557778 has 16 divisors (see below), whose sum is σ = 2060767296. Its totient is φ = 539724240.

The previous prime is 1222557767. The next prime is 1222557797. The reversal of 1222557778 is 8777552221.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a plaindrome in base 10.

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, 1021608 + ... + 1022803.

It is an arithmetic number, because the mean of its divisors is an integer number (128797956).

Almost surely, 2^1222557778 is an apocalyptic number.

1222557778 is a deficient number, since it is larger than the sum of its proper divisors (838209518).

1222557778 is a wasteful number, since it uses less digits than its factorization.

1222557778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044449.

The product of its digits is 548800, while the sum is 46.

The square root of 1222557778 is about 34965.0937078681. The cubic root of 1222557778 is about 1069.2759471071.

The spelling of 1222557778 in words is "one billion, two hundred twenty-two million, five hundred fifty-seven thousand, seven hundred seventy-eight".