3204640 has 24 divisors (see below), whose sum is σ = 7571340. Its totient is φ = 1281792.

The previous prime is 3204631. The next prime is 3204647. The reversal of 3204640 is 464023.

It can be written as a sum of positive squares in 2 ways, for example, as 3083536 + 121104 = 1756^2 + 348^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3204647) 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, 9855 + ... + 10174.

Almost surely, 2^3204640 is an apocalyptic number.

It is an amenable number.

3204640 is an abundant number, since it is smaller than the sum of its proper divisors (4366700).

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

3204640 is a wasteful number, since it uses less digits than its factorization.

3204640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20044 (or 20036 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 3204640 is about 1790.1508316340. The cubic root of 3204640 is about 147.4324501571.

Adding to 3204640 its reverse (464023), we get a palindrome (3668663).

It can be divided in two parts, 3204 and 640, that added together give a square (3844 = 62²).

The spelling of 3204640 in words is "three million, two hundred four thousand, six hundred forty".