3521201640 has 192 divisors, whose sum is σ = 11679655680. Its totient is φ = 848601600.

The previous prime is 3521201611. The next prime is 3521201641. The reversal of 3521201640 is 461021253.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 3521201640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521201641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2859825 + ... + 2861055.

It is an arithmetic number, because the mean of its divisors is an integer number (60831540).

Almost surely, 2^3521201640 is an apocalyptic number.

3521201640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3521201640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5839827840).

3521201640 is an abundant number, since it is smaller than the sum of its proper divisors (8158454040).

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

3521201640 is a wasteful number, since it uses less digits than its factorization.

3521201640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 3521201640 is about 59339.7138516862. The cubic root of 3521201640 is about 1521.3540623307.

Adding to 3521201640 its reverse (461021253), we get a palindrome (3982222893).

The spelling of 3521201640 in words is "three billion, five hundred twenty-one million, two hundred one thousand, six hundred forty".