1325591620 has 96 divisors (see below), whose sum is σ = 3051417600. Its totient is φ = 481852800.

The previous prime is 1325591599. The next prime is 1325591629. The reversal of 1325591620 is 261955231.

It is not an unprimeable number, because it can be changed into a prime (1325591629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1542751 + ... + 1543609.

It is an arithmetic number, because the mean of its divisors is an integer number (31785600).

Almost surely, 2^1325591620 is an apocalyptic number.

1325591620 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 1325591620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1525708800).

1325591620 is an abundant number, since it is smaller than the sum of its proper divisors (1725825980).

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

1325591620 is a wasteful number, since it uses less digits than its factorization.

1325591620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 1325591620 is about 36408.6750651545. The cubic root of 1325591620 is about 1098.5080655524.

The spelling of 1325591620 in words is "one billion, three hundred twenty-five million, five hundred ninety-one thousand, six hundred twenty".