3276728640 has 168 divisors, whose sum is σ = 11688287520. Its totient is φ = 873773568.

The previous prime is 3276728549. The next prime is 3276728641. The reversal of 3276728640 is 468276723.

3276728640 is a `hidden beast` number, since 327 + 6 + 7 + 286 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3276728641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56691 + ... + 98829.

It is an arithmetic number, because the mean of its divisors is an integer number (69573140).

Almost surely, 2^3276728640 is an apocalyptic number.

3276728640 is a gapful number since it is divisible by the number (30) 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 3276728640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5844143760).

3276728640 is an abundant number, since it is smaller than the sum of its proper divisors (8411558880).

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

3276728640 is an equidigital number, since it uses as much as digits as its factorization.

3276728640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42171 (or 42149 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 3276728640 is about 57242.7169166524. The cubic root of 3276728640 is about 1485.2976446538.

The spelling of 3276728640 in words is "three billion, two hundred seventy-six million, seven hundred twenty-eight thousand, six hundred forty".