3520640 has 32 divisors (see below), whose sum is σ = 8418060. Its totient is φ = 1408000.

The previous prime is 3520613. The next prime is 3520663. The reversal of 3520640 is 460253.

It can be written as a sum of positive squares in 2 ways, for example, as 3297856 + 222784 = 1816^2 + 472^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 2111 + ... + 3390.

Almost surely, 2^3520640 is an apocalyptic number.

It is an amenable number.

3520640 is an abundant number, since it is smaller than the sum of its proper divisors (4897420).

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

3520640 is an equidigital number, since it uses as much as digits as its factorization.

3520640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5520 (or 5508 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 3520640 is about 1876.3368567504. The cubic root of 3520640 is about 152.1273171505.

Adding to 3520640 its reverse (460253), we get a palindrome (3980893).

The spelling of 3520640 in words is "three million, five hundred twenty thousand, six hundred forty".