3521331840 has 128 divisors (see below), whose sum is σ = 12087734400. Its totient is φ = 866783232.

The previous prime is 3521331829. The next prime is 3521331841. The reversal of 3521331840 is 481331253.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 3521331798 and 3521331807.

It is not an unprimeable number, because it can be changed into a prime (3521331841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45580 + ... + 95499.

It is an arithmetic number, because the mean of its divisors is an integer number (94435425).

Almost surely, 2^3521331840 is an apocalyptic number.

3521331840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3521331840 is an abundant number, since it is smaller than the sum of its proper divisors (8566402560).

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

3521331840 is a wasteful number, since it uses less digits than its factorization.

3521331840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141114 (or 141102 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 3521331840 is about 59340.8109145805. The cubic root of 3521331840 is about 1521.3728133025.

The spelling of 3521331840 in words is "three billion, five hundred twenty-one million, three hundred thirty-one thousand, eight hundred forty".