3784580721 has 12 divisors (see below), whose sum is σ = 5754333520. Its totient is φ = 2390261400.

The previous prime is 3784580687. The next prime is 3784580729. The reversal of 3784580721 is 1270854873.

It is not a de Polignac number, because 3784580721 - 2¹⁰ = 3784579697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3784580729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11065855 + ... + 11066196.

Almost surely, 2^3784580721 is an apocalyptic number.

It is an amenable number.

3784580721 is a deficient number, since it is larger than the sum of its proper divisors (1969752799).

3784580721 is a wasteful number, since it uses less digits than its factorization.

3784580721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22132076 (or 22132073 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 3784580721 is about 61518.9460329092. The cubic root of 3784580721 is about 1558.3772190551.

The spelling of 3784580721 in words is "three billion, seven hundred eighty-four million, five hundred eighty thousand, seven hundred twenty-one".