1223665680 has 160 divisors (see below), whose sum is σ = 3923748864. Its totient is φ = 315278848.

The previous prime is 1223665657. The next prime is 1223665687. The reversal of 1223665680 is 865663221.

It is not an unprimeable number, because it can be changed into a prime (1223665687) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 935587 + ... + 936893.

Almost surely, 2^1223665680 is an apocalyptic number.

1223665680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223665680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1961874432).

1223665680 is an abundant number, since it is smaller than the sum of its proper divisors (2700083184).

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

1223665680 is a wasteful number, since it uses less digits than its factorization.

1223665680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 1223665680 is about 34980.9330921861. The cubic root of 1223665680 is about 1069.5988480805.

The spelling of 1223665680 in words is "one billion, two hundred twenty-three million, six hundred sixty-five thousand, six hundred eighty".