1223456780 has 48 divisors (see below), whose sum is σ = 3162169920. Its totient is φ = 387203328.

The previous prime is 1223456761. The next prime is 1223456807. The reversal of 1223456780 is 876543221.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 334295 + ... + 337934.

It is an arithmetic number, because the mean of its divisors is an integer number (65878540).

Almost surely, 2^1223456780 is an apocalyptic number.

1223456780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223456780 is an abundant number, since it is smaller than the sum of its proper divisors (1938713140).

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

1223456780 is a wasteful number, since it uses less digits than its factorization.

1223456780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672258 (or 672256 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1223456780 is about 34977.9470523929. The cubic root of 1223456780 is about 1069.5379785366.

The spelling of 1223456780 in words is "one billion, two hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty".