1326621560 has 128 divisors (see below), whose sum is σ = 3326400000. Its totient is φ = 472158720.

The previous prime is 1326621547. The next prime is 1326621587. The reversal of 1326621560 is 651266231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6666341 + ... + 6666539.

It is an arithmetic number, because the mean of its divisors is an integer number (25987500).

Almost surely, 2^1326621560 is an apocalyptic number.

1326621560 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 1326621560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1663200000).

1326621560 is an abundant number, since it is smaller than the sum of its proper divisors (1999778440).

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

1326621560 is a wasteful number, since it uses less digits than its factorization.

1326621560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1326621560 is about 36422.8164753908. The cubic root of 1326621560 is about 1098.7924931461.

Adding to 1326621560 its reverse (651266231), we get a palindrome (1977887791).

The spelling of 1326621560 in words is "one billion, three hundred twenty-six million, six hundred twenty-one thousand, five hundred sixty".