321543712 has 72 divisors (see below), whose sum is σ = 768688704. Its totient is φ = 129672192.

The previous prime is 321543683. The next prime is 321543713. The reversal of 321543712 is 217345123.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (321543713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62253 + ... + 67219.

It is an arithmetic number, because the mean of its divisors is an integer number (10676232).

Almost surely, 2^321543712 is an apocalyptic number.

321543712 is a gapful number since it is divisible by the number (32) 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 321543712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384344352).

321543712 is an abundant number, since it is smaller than the sum of its proper divisors (447144992).

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

321543712 is a wasteful number, since it uses less digits than its factorization.

321543712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018 (or 4993 counting only the distinct ones).

The product of its digits is 5040, while the sum is 28.

The square root of 321543712 is about 17931.6399696179. The cubic root of 321543712 is about 685.0884940815.

Adding to 321543712 its reverse (217345123), we get a palindrome (538888835).

The spelling of 321543712 in words is "three hundred twenty-one million, five hundred forty-three thousand, seven hundred twelve".