324440640 has 140 divisors (see below), whose sum is σ = 1154184636. Its totient is φ = 86510592.

The previous prime is 324440629. The next prime is 324440647. The reversal of 324440640 is 46044423.

It can be written as a sum of positive squares in 2 ways, for example, as 224280576 + 100160064 = 14976^2 + 10008^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (324440647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19662 + ... + 32178.

Almost surely, 2^324440640 is an apocalyptic number.

324440640 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 324440640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (577092318).

324440640 is an abundant number, since it is smaller than the sum of its proper divisors (829743996).

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

324440640 is a wasteful number, since it uses less digits than its factorization.

324440640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12546 (or 12527 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 324440640 is about 18012.2358412275. The cubic root of 324440640 is about 687.1397667616.

The spelling of 324440640 in words is "three hundred twenty-four million, four hundred forty thousand, six hundred forty".