2721990605 has 8 divisors (see below), whose sum is σ = 3379023000. Its totient is φ = 2102502976.

The previous prime is 2721990599. The next prime is 2721990613. The reversal of 2721990605 is 5060991272.

It can be written as a sum of positive squares in 4 ways, for example, as 929823049 + 1792167556 = 30493^2 + 42334^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2721990605 - 2⁶ = 2721990541 is a prime.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9386030 + ... + 9386319.

It is an arithmetic number, because the mean of its divisors is an integer number (422377875).

Almost surely, 2^2721990605 is an apocalyptic number.

It is an amenable number.

2721990605 is a deficient number, since it is larger than the sum of its proper divisors (657032395).

2721990605 is a wasteful number, since it uses less digits than its factorization.

2721990605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18772383.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 2721990605 is about 52172.6998055496. The cubic root of 2721990605 is about 1396.2468530949.

The spelling of 2721990605 in words is "two billion, seven hundred twenty-one million, nine hundred ninety thousand, six hundred five".