3240640 has 112 divisors (see below), whose sum is σ = 8961120. Its totient is φ = 1105920.

The previous prime is 3240619. The next prime is 3240649. The reversal of 3240640 is 460423.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (3240649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79020 + ... + 79060.

It is an arithmetic number, because the mean of its divisors is an integer number (80010).

Almost surely, 2^3240640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3240640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4480560).

3240640 is an abundant number, since it is smaller than the sum of its proper divisors (5720480).

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

3240640 is a wasteful number, since it uses less digits than its factorization.

3240640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 80 counting only the distinct ones).

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

The square root of 3240640 is about 1800.1777689995. The cubic root of 3240640 is about 147.9824668784.

It can be divided in two parts, 3240 and 640, that multiplied together give a square (2073600 = 1440²).

The spelling of 3240640 in words is "three million, two hundred forty thousand, six hundred forty".