1326410640 has 360 divisors, whose sum is σ = 4840565184. Its totient is φ = 337478400.

The previous prime is 1326410597. The next prime is 1326410651. The reversal of 1326410640 is 460146231.

1326410640 is a `hidden beast` number, since 1 + 3 + 2 + 6 + 4 + 10 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 18681805 + ... + 18681875.

Almost surely, 2^1326410640 is an apocalyptic number.

1326410640 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 1326410640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2420282592).

1326410640 is an abundant number, since it is smaller than the sum of its proper divisors (3514154544).

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

1326410640 is an equidigital number, since it uses as much as digits as its factorization.

1326410640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1326410640 is about 36419.9209224842. The cubic root of 1326410640 is about 1098.7342575992.

Adding to 1326410640 its reverse (460146231), we get a palindrome (1786556871).

The spelling of 1326410640 in words is "one billion, three hundred twenty-six million, four hundred ten thousand, six hundred forty".