3280645 has 4 divisors (see below), whose sum is σ = 3936780. Its totient is φ = 2624512.

The previous prime is 3280639. The next prime is 3280649. The reversal of 3280645 is 5460823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5460823 = 71 ⋅76913.

It can be written as a sum of positive squares in 2 ways, for example, as 2169729 + 1110916 = 1473^2 + 1054^2 .

It is a cyclic number.

It is not a de Polignac number, because 3280645 - 2⁷ = 3280517 is a prime.

3280645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3280649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328060 + ... + 328069.

It is an arithmetic number, because the mean of its divisors is an integer number (984195).

Almost surely, 2^3280645 is an apocalyptic number.

It is an amenable number.

3280645 is a deficient number, since it is larger than the sum of its proper divisors (656135).

3280645 is an equidigital number, since it uses as much as digits as its factorization.

3280645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656134.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 3280645 is about 1811.2550897099. The cubic root of 3280645 is about 148.5889153745.

The spelling of 3280645 in words is "three million, two hundred eighty thousand, six hundred forty-five".