1223855728 has 20 divisors (see below), whose sum is σ = 2393384760. Its totient is φ = 606208064.

The previous prime is 1223855719. The next prime is 1223855741. The reversal of 1223855728 is 8275583221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355723 + ... + 359146.

It is an arithmetic number, because the mean of its divisors is an integer number (119669238).

Almost surely, 2^1223855728 is an apocalyptic number.

It is an amenable number.

1223855728 is a deficient number, since it is larger than the sum of its proper divisors (1169529032).

1223855728 is a wasteful number, since it uses less digits than its factorization.

1223855728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714984 (or 714978 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The square root of 1223855728 is about 34983.6494379875. The cubic root of 1223855728 is about 1069.6542184873.

The spelling of 1223855728 in words is "one billion, two hundred twenty-three million, eight hundred fifty-five thousand, seven hundred twenty-eight".