3521991620 has 72 divisors (see below), whose sum is σ = 9056597760. Its totient is φ = 1143979200.

The previous prime is 3521991521. The next prime is 3521991637. The reversal of 3521991620 is 261991253.

It is a Harshad number since it is a multiple of its sum of digits (38).

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 23 ways as a sum of consecutive naturals, for example, 75956 + ... + 113195.

It is an arithmetic number, because the mean of its divisors is an integer number (125786080).

Almost surely, 2^3521991620 is an apocalyptic number.

It is an amenable number.

3521991620 is an abundant number, since it is smaller than the sum of its proper divisors (5534606140).

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

3521991620 is a wasteful number, since it uses less digits than its factorization.

3521991620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189193 (or 189184 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 3521991620 is about 59346.3698974082. The cubic root of 3521991620 is about 1521.4678255228.

The spelling of 3521991620 in words is "three billion, five hundred twenty-one million, nine hundred ninety-one thousand, six hundred twenty".