3261407720 has 64 divisors (see below), whose sum is σ = 7518873600. Its totient is φ = 1272821760.

The previous prime is 3261407717. The next prime is 3261407753. The reversal of 3261407720 is 277041623.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 269561 + ... + 281399.

It is an arithmetic number, because the mean of its divisors is an integer number (117482400).

Almost surely, 2^3261407720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3261407720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3759436800).

3261407720 is an abundant number, since it is smaller than the sum of its proper divisors (4257465880).

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

3261407720 is a wasteful number, since it uses less digits than its factorization.

3261407720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12018 (or 12014 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 3261407720 is about 57108.7359341809. The cubic root of 3261407720 is about 1482.9791040131.

The spelling of 3261407720 in words is "three billion, two hundred sixty-one million, four hundred seven thousand, seven hundred twenty".