3520530640 has 80 divisors (see below), whose sum is σ = 8942034816. Its totient is φ = 1278374400.

The previous prime is 3520530619. The next prime is 3520530667. The reversal of 3520530640 is 460350253.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 3520530599 and 3520530608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 721810 + ... + 726670.

Almost surely, 2^3520530640 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 3520530640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4471017408).

3520530640 is an abundant number, since it is smaller than the sum of its proper divisors (5421504176).

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

3520530640 is a wasteful number, since it uses less digits than its factorization.

3520530640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5708 (or 5702 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 3520530640 is about 59334.0596959284. The cubic root of 3520530640 is about 1521.2574198083.

Adding to 3520530640 its reverse (460350253), we get a palindrome (3980880893).

The spelling of 3520530640 in words is "three billion, five hundred twenty million, five hundred thirty thousand, six hundred forty".