3278720656 has 20 divisors (see below), whose sum is σ = 6628718592. Its totient is φ = 1568083616.

The previous prime is 3278720639. The next prime is 3278720663. The reversal of 3278720656 is 6560278723.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4454416 + ... + 4455151.

Almost surely, 2^3278720656 is an apocalyptic number.

It is an amenable number.

3278720656 is an abundant number, since it is smaller than the sum of its proper divisors (3349997936).

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

3278720656 is a wasteful number, since it uses less digits than its factorization.

3278720656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8909598 (or 8909592 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The square root of 3278720656 is about 57260.1140061736. The cubic root of 3278720656 is about 1485.5985684952.

The spelling of 3278720656 in words is "three billion, two hundred seventy-eight million, seven hundred twenty thousand, six hundred fifty-six".