3521684720 has 20 divisors (see below), whose sum is σ = 8187917160. Its totient is φ = 1408673856.

The previous prime is 3521684717. The next prime is 3521684729. The reversal of 3521684720 is 274861253.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521684729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22010450 + ... + 22010609.

It is an arithmetic number, because the mean of its divisors is an integer number (409395858).

Almost surely, 2^3521684720 is an apocalyptic number.

It is an amenable number.

3521684720 is an abundant number, since it is smaller than the sum of its proper divisors (4666232440).

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

3521684720 is a wasteful number, since it uses less digits than its factorization.

3521684720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44021072 (or 44021066 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 3521684720 is about 59343.7841732392. The cubic root of 3521684720 is about 1521.4236315847.

The spelling of 3521684720 in words is "three billion, five hundred twenty-one million, six hundred eighty-four thousand, seven hundred twenty".