1305324640 has 24 divisors (see below), whose sum is σ = 3083829840. Its totient is φ = 522129792.

The previous prime is 1305324637. The next prime is 1305324659. The reversal of 1305324640 is 464235031.

It is a super-2 number, since 2×1305324640² = 3407744831582259200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1305324599 and 1305324608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4078980 + ... + 4079299.

It is an arithmetic number, because the mean of its divisors is an integer number (128492910).

Almost surely, 2^1305324640 is an apocalyptic number.

1305324640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305324640 is an abundant number, since it is smaller than the sum of its proper divisors (1778505200).

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

1305324640 is an equidigital number, since it uses as much as digits as its factorization.

1305324640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8158294 (or 8158286 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 1305324640 is about 36129.2767710620. The cubic root of 1305324640 is about 1092.8809236041.

Adding to 1305324640 its reverse (464235031), we get a palindrome (1769559671).

The spelling of 1305324640 in words is "one billion, three hundred five million, three hundred twenty-four thousand, six hundred forty".