1323644400 has 180 divisors, whose sum is σ = 4946928168. Its totient is φ = 325808640.

The previous prime is 1323644393. The next prime is 1323644423. The reversal of 1323644400 is 44463231.

1323644400 is a `hidden beast` number, since 13 + 2 + 3 + 644 + 4 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a congruent number.

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 35 ways as a sum of consecutive naturals, for example, 32659 + ... + 60941.

Almost surely, 2^1323644400 is an apocalyptic number.

1323644400 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 1323644400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2473464084).

1323644400 is an abundant number, since it is smaller than the sum of its proper divisors (3623283768).

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

1323644400 is a wasteful number, since it uses less digits than its factorization.

1323644400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28320 (or 28306 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 1323644400 is about 36381.9240832587. The cubic root of 1323644400 is about 1097.9699196473.

The spelling of 1323644400 in words is "one billion, three hundred twenty-three million, six hundred forty-four thousand, four hundred".