3521025640 has 64 divisors (see below), whose sum is σ = 8728197120. Its totient is φ = 1267680000.

The previous prime is 3521025619. The next prime is 3521025649. The reversal of 3521025640 is 465201253.

It is a junction number, because it is equal to n+sod(n) for n = 3521025599 and 3521025608.

It is not an unprimeable number, because it can be changed into a prime (3521025649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4825 + ... + 84055.

It is an arithmetic number, because the mean of its divisors is an integer number (136378080).

Almost surely, 2^3521025640 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 3521025640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4364098560).

3521025640 is an abundant number, since it is smaller than the sum of its proper divisors (5207171480).

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

3521025640 is a wasteful number, since it uses less digits than its factorization.

3521025640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79354 (or 79350 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 3521025640 is about 59338.2308465630. The cubic root of 3521025640 is about 1521.3287146603.

Adding to 3521025640 its reverse (465201253), we get a palindrome (3986226893).

The spelling of 3521025640 in words is "three billion, five hundred twenty-one million, twenty-five thousand, six hundred forty".