1326368640 has 64 divisors (see below), whose sum is σ = 4227806160. Its totient is φ = 353697792.

The previous prime is 1326368639. The next prime is 1326368657. The reversal of 1326368640 is 468636231.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343489 + ... + 347328.

Almost surely, 2^1326368640 is an apocalyptic number.

1326368640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1326368640 is an abundant number, since it is smaller than the sum of its proper divisors (2901437520).

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

1326368640 is an equidigital number, since it uses as much as digits as its factorization.

1326368640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690839 (or 690827 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 1326368640 is about 36419.3443104073. The cubic root of 1326368640 is about 1098.7226605557.

The spelling of 1326368640 in words is "one billion, three hundred twenty-six million, three hundred sixty-eight thousand, six hundred forty".