3205721380 has 48 divisors (see below), whose sum is σ = 6895715904. Its totient is φ = 1251169920.

The previous prime is 3205721371. The next prime is 3205721383. The reversal of 3205721380 is 831275023.

It is not an unprimeable number, because it can be changed into a prime (3205721383) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1599459 + ... + 1601461.

It is an arithmetic number, because the mean of its divisors is an integer number (143660748).

Almost surely, 2^3205721380 is an apocalyptic number.

It is an amenable number.

3205721380 is an abundant number, since it is smaller than the sum of its proper divisors (3689994524).

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

3205721380 is a wasteful number, since it uses less digits than its factorization.

3205721380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3916 (or 3914 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 3205721380 is about 56619.0902434859. The cubic root of 3205721380 is about 1474.4903159039.

The spelling of 3205721380 in words is "three billion, two hundred five million, seven hundred twenty-one thousand, three hundred eighty".