3261725729 has 32 divisors (see below), whose sum is σ = 3567421440. Its totient is φ = 2974809600.

The previous prime is 3261725699. The next prime is 3261725743. The reversal of 3261725729 is 9275271623.

It is a happy number.

It is not a de Polignac number, because 3261725729 - 2²⁴ = 3244948513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3261725729.

It is not an unprimeable number, because it can be changed into a prime (3261725429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8744387 + ... + 8744759.

It is an arithmetic number, because the mean of its divisors is an integer number (111481920).

Almost surely, 2^3261725729 is an apocalyptic number.

It is an amenable number.

3261725729 is a deficient number, since it is larger than the sum of its proper divisors (305695711).

3261725729 is a wasteful number, since it uses less digits than its factorization.

3261725729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641.

The product of its digits is 317520, while the sum is 44.

The square root of 3261725729 is about 57111.5201075930. The cubic root of 3261725729 is about 1483.0273025636.

The spelling of 3261725729 in words is "three billion, two hundred sixty-one million, seven hundred twenty-five thousand, seven hundred twenty-nine".