1326888640 has 280 divisors, whose sum is σ = 4046750352. Its totient is φ = 410941440.

The previous prime is 1326888613. The next prime is 1326888643. The reversal of 1326888640 is 468886231.

It is a tau number, because it is divible by the number of its divisors (280).

It is a super-2 number, since 2×1326888640² = 3521266925922099200, which contains 22 as substring.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1326888643) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8451442 + ... + 8451598.

Almost surely, 2^1326888640 is an apocalyptic number.

1326888640 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 1326888640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2023375176).

1326888640 is an abundant number, since it is smaller than the sum of its proper divisors (2719861712).

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

1326888640 is an equidigital number, since it uses as much as digits as its factorization.

1326888640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 1326888640 is about 36426.4826740107. The cubic root of 1326888640 is about 1098.8662257554.

The spelling of 1326888640 in words is "one billion, three hundred twenty-six million, eight hundred eighty-eight thousand, six hundred forty".