2720023209 has 6 divisors (see below), whose sum is σ = 3928922426. Its totient is φ = 1813348800.

The previous prime is 2720023199. The next prime is 2720023231. The reversal of 2720023209 is 9023200272.

It can be written as a sum of positive squares in only one way, i.e., 2662869609 + 57153600 = 51603^2 + 7560^2 .

It is not a de Polignac number, because 2720023209 - 2⁴ = 2720023193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2720023909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151112392 + ... + 151112409.

Almost surely, 2^2720023209 is an apocalyptic number.

It is an amenable number.

2720023209 is a deficient number, since it is larger than the sum of its proper divisors (1208899217).

2720023209 is a wasteful number, since it uses less digits than its factorization.

2720023209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302224807 (or 302224804 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 2720023209 is about 52153.8417472769. The cubic root of 2720023209 is about 1395.9103796636.

The spelling of 2720023209 in words is "two billion, seven hundred twenty million, twenty-three thousand, two hundred nine".