328421721600 has 720 divisors, whose sum is σ = 1422308261088. Its totient is φ = 70649118720.

The previous prime is 328421721599. The next prime is 328421721643. The reversal of 328421721600 is 6127124823.

It is a happy number.

328421721600 is a `hidden beast` number, since 3 + 2 + 8 + 4 + 21 + 7 + 21 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13696822 + ... + 13720778.

Almost surely, 2^328421721600 is an apocalyptic number.

328421721600 is a gapful number since it is divisible by the number (30) 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 328421721600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (711154130544).

328421721600 is an abundant number, since it is smaller than the sum of its proper divisors (1093886539488).

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

328421721600 is a wasteful number, since it uses less digits than its factorization.

328421721600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24015 (or 23991 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 328421721600 in words is "three hundred twenty-eight billion, four hundred twenty-one million, seven hundred twenty-one thousand, six hundred".