326451709920 has 768 divisors, whose sum is σ = 1297254776832. Its totient is φ = 67288596480.

The previous prime is 326451709901. The next prime is 326451709943. The reversal of 326451709920 is 29907154623.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 326451709920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 189466179 + ... + 189467901.

It is an arithmetic number, because the mean of its divisors is an integer number (1689133824).

Almost surely, 2^326451709920 is an apocalyptic number.

326451709920 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 326451709920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (648627388416).

326451709920 is an abundant number, since it is smaller than the sum of its proper divisors (970803066912).

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

326451709920 is a wasteful number, since it uses less digits than its factorization.

326451709920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 326451709920 in words is "three hundred twenty-six billion, four hundred fifty-one million, seven hundred nine thousand, nine hundred twenty".