1327321720 has 64 divisors (see below), whose sum is σ = 3200627520. Its totient is φ = 494106624.

The previous prime is 1327321717. The next prime is 1327321727. The reversal of 1327321720 is 271237231.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327321727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14544 + ... + 53536.

It is an arithmetic number, because the mean of its divisors is an integer number (50009805).

Almost surely, 2^1327321720 is an apocalyptic number.

1327321720 is a gapful number since it is divisible by the number (10) 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 1327321720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1600313760).

1327321720 is an abundant number, since it is smaller than the sum of its proper divisors (1873305800).

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

1327321720 is a wasteful number, since it uses less digits than its factorization.

1327321720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39064 (or 39060 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 1327321720 is about 36432.4267651772. The cubic root of 1327321720 is about 1098.9857648547.

Adding to 1327321720 its reverse (271237231), we get a palindrome (1598558951).

The spelling of 1327321720 in words is "one billion, three hundred twenty-seven million, three hundred twenty-one thousand, seven hundred twenty".