1325581872 has 40 divisors (see below), whose sum is σ = 3444946176. Its totient is φ = 439212096.

The previous prime is 1325581871. The next prime is 1325581877. The reversal of 1325581872 is 2781855231.

It is not an unprimeable number, because it can be changed into a prime (1325581871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74668 + ... + 90699.

Almost surely, 2^1325581872 is an apocalyptic number.

1325581872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1325581872 is an abundant number, since it is smaller than the sum of its proper divisors (2119364304).

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

1325581872 is a wasteful number, since it uses less digits than its factorization.

1325581872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165545 (or 165539 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 1325581872 is about 36408.5411957140. The cubic root of 1325581872 is about 1098.5053728470.

The spelling of 1325581872 in words is "one billion, three hundred twenty-five million, five hundred eighty-one thousand, eight hundred seventy-two".