326505816 has 320 divisors, whose sum is σ = 1158696000. Its totient is φ = 85349376.

The previous prime is 326505793. The next prime is 326505853. The reversal of 326505816 is 618505623.

326505816 is a `hidden beast` number, since 3 + 26 + 50 + 581 + 6 = 666.

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 79 ways as a sum of consecutive naturals, for example, 2889376 + ... + 2889488.

It is an arithmetic number, because the mean of its divisors is an integer number (3620925).

Almost surely, 2^326505816 is an apocalyptic number.

326505816 is a gapful number since it is divisible by the number (36) 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 326505816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579348000).

326505816 is an abundant number, since it is smaller than the sum of its proper divisors (832190184).

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

326505816 is a wasteful number, since it uses less digits than its factorization.

326505816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 326505816 is about 18069.4719347301. The cubic root of 326505816 is about 688.5946443147.

The spelling of 326505816 in words is "three hundred twenty-six million, five hundred five thousand, eight hundred sixteen".