1326217720 has 64 divisors (see below), whose sum is σ = 3141529920. Its totient is φ = 502892544.

The previous prime is 1326217709. The next prime is 1326217729. The reversal of 1326217720 is 277126231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326217729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97582 + ... + 110338.

It is an arithmetic number, because the mean of its divisors is an integer number (49086405).

Almost surely, 2^1326217720 is an apocalyptic number.

1326217720 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 1326217720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1570764960).

1326217720 is an abundant number, since it is smaller than the sum of its proper divisors (1815312200).

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

1326217720 is a wasteful number, since it uses less digits than its factorization.

1326217720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12904 (or 12900 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 1326217720 is about 36417.2722756661. The cubic root of 1326217720 is about 1098.6809864920.

The spelling of 1326217720 in words is "one billion, three hundred twenty-six million, two hundred seventeen thousand, seven hundred twenty".