3261162640 has 80 divisors (see below), whose sum is σ = 7959990528. Its totient is φ = 1240160768.

The previous prime is 3261162599. The next prime is 3261162689. The reversal of 3261162640 is 462611623.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301974 + ... + 312586.

Almost surely, 2^3261162640 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 3261162640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3979995264).

3261162640 is an abundant number, since it is smaller than the sum of its proper divisors (4698827888).

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

3261162640 is a wasteful number, since it uses less digits than its factorization.

3261162640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10816 (or 10810 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 3261162640 is about 57106.5901626073. The cubic root of 3261162640 is about 1482.9419566977.

The spelling of 3261162640 in words is "three billion, two hundred sixty-one million, one hundred sixty-two thousand, six hundred forty".