1328021325 has 60 divisors (see below), whose sum is σ = 2473184340. Its totient is φ = 704471040.

The previous prime is 1328021323. The next prime is 1328021327. The reversal of 1328021325 is 5231208231.

It is an interprime number because it is at equal distance from previous prime (1328021323) and next prime (1328021327).

It can be written as a sum of positive squares in 6 ways, for example, as 20331081 + 1307690244 = 4509^2 + 36162^2 .

It is not a de Polignac number, because 1328021325 - 2¹ = 1328021323 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328021323) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 397261 + ... + 400589.

It is an arithmetic number, because the mean of its divisors is an integer number (41219739).

Almost surely, 2^1328021325 is an apocalyptic number.

1328021325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1328021325 is a deficient number, since it is larger than the sum of its proper divisors (1145163015).

1328021325 is a wasteful number, since it uses less digits than its factorization.

1328021325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548 (or 3534 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1328021325 is about 36442.0269057581. The cubic root of 1328021325 is about 1099.1788154872.

Adding to 1328021325 its reverse (5231208231), we get a palindrome (6559229556).

The spelling of 1328021325 in words is "one billion, three hundred twenty-eight million, twenty-one thousand, three hundred twenty-five".