1326020640 has 192 divisors, whose sum is σ = 5025162240. Its totient is φ = 287124480.

The previous prime is 1326020611. The next prime is 1326020653. The reversal of 1326020640 is 460206231.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1326020640.

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, 53455 + ... + 74225.

It is an arithmetic number, because the mean of its divisors is an integer number (26172720).

Almost surely, 2^1326020640 is an apocalyptic number.

1326020640 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 1326020640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2512581120).

1326020640 is an abundant number, since it is smaller than the sum of its proper divisors (3699141600).

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

1326020640 is a wasteful number, since it uses less digits than its factorization.

1326020640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20815 (or 20807 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1326020640 is about 36414.5663162422. The cubic root of 1326020640 is about 1098.6265613470.

Adding to 1326020640 its reverse (460206231), we get a palindrome (1786226871).

The spelling of 1326020640 in words is "one billion, three hundred twenty-six million, twenty thousand, six hundred forty".