3261389472 has 216 divisors, whose sum is σ = 10526705280. Its totient is φ = 956102400.

The previous prime is 3261389471. The next prime is 3261389491. The reversal of 3261389472 is 2749831623.

3261389472 is a `hidden beast` number, since 3 + 261 + 389 + 4 + 7 + 2 = 666.

It is a super-2 number, since 2×3261389472² = 21273322576144877568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3261389471) 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 35 ways as a sum of consecutive naturals, for example, 1078779 + ... + 1081797.

Almost surely, 2^3261389472 is an apocalyptic number.

3261389472 is a gapful number since it is divisible by the number (32) 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 3261389472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5263352640).

3261389472 is an abundant number, since it is smaller than the sum of its proper divisors (7265315808).

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

3261389472 is a wasteful number, since it uses less digits than its factorization.

3261389472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088 (or 3066 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 3261389472 is about 57108.5761685581. The cubic root of 3261389472 is about 1482.9763381876.

The spelling of 3261389472 in words is "three billion, two hundred sixty-one million, three hundred eighty-nine thousand, four hundred seventy-two".