1225554778 has 32 divisors (see below), whose sum is σ = 2147040000. Its totient is φ = 524451312.

The previous prime is 1225554767. The next prime is 1225554779. The reversal of 1225554778 is 8774555221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1225554779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 875323 + ... + 876721.

It is an arithmetic number, because the mean of its divisors is an integer number (67095000).

Almost surely, 2^1225554778 is an apocalyptic number.

1225554778 is a deficient number, since it is larger than the sum of its proper divisors (921485222).

1225554778 is a wasteful number, since it uses less digits than its factorization.

1225554778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699 (or 2685 counting only the distinct ones).

The product of its digits is 784000, while the sum is 46.

The square root of 1225554778 is about 35007.9245028893. The cubic root of 1225554778 is about 1070.1489814974.

The spelling of 1225554778 in words is "one billion, two hundred twenty-five million, five hundred fifty-four thousand, seven hundred seventy-eight".