3520072131720 has 128 divisors (see below), whose sum is σ = 10758132685440. Its totient is φ = 921164451840.

The previous prime is 3520072131703. The next prime is 3520072131743. The reversal of 3520072131720 is 271312700253.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2614267 + ... + 3724853.

It is an arithmetic number, because the mean of its divisors is an integer number (84047911605).

Almost surely, 2^{3520072131720} is an apocalyptic number.

3520072131720 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 3520072131720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5379066342720).

3520072131720 is an abundant number, since it is smaller than the sum of its proper divisors (7238060553720).

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

3520072131720 is a wasteful number, since it uses less digits than its factorization.

3520072131720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111095 (or 1111091 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

Adding to 3520072131720 its reverse (271312700253), we get a palindrome (3791384831973).

The spelling of 3520072131720 in words is "three trillion, five hundred twenty billion, seventy-two million, one hundred thirty-one thousand, seven hundred twenty".