1224456778 has 8 divisors (see below), whose sum is σ = 1841312772. Its totient is φ = 610685856.

The previous prime is 1224456769. The next prime is 1224456781. The reversal of 1224456778 is 8776544221.

It can be written as a sum of positive squares in 2 ways, for example, as 1183841649 + 40615129 = 34407^2 + 6373^2 .

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

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770275 + ... + 771862.

Almost surely, 2^1224456778 is an apocalyptic number.

1224456778 is a deficient number, since it is larger than the sum of its proper divisors (616855994).

1224456778 is a wasteful number, since it uses less digits than its factorization.

1224456778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542536.

The product of its digits is 752640, while the sum is 46.

The square root of 1224456778 is about 34992.2388252024. The cubic root of 1224456778 is about 1069.8292964354.

The spelling of 1224456778 in words is "one billion, two hundred twenty-four million, four hundred fifty-six thousand, seven hundred seventy-eight".