2720778361 has 6 divisors (see below), whose sum is σ = 3164987130. Its totient is φ = 2332095696.

The previous prime is 2720778337. The next prime is 2720778419. The reversal of 2720778361 is 1638770272.

It can be written as a sum of positive squares in only one way, i.e., 1532252736 + 1188525625 = 39144^2 + 34475^2 .

It is not a de Polignac number, because 2720778361 - 2¹⁵ = 2720745593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2720778301) 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, 27762996 + ... + 27763093.

It is an arithmetic number, because the mean of its divisors is an integer number (527497855).

Almost surely, 2^2720778361 is an apocalyptic number.

It is an amenable number.

2720778361 is a deficient number, since it is larger than the sum of its proper divisors (444208769).

2720778361 is an equidigital number, since it uses as much as digits as its factorization.

2720778361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55526103 (or 55526096 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 2720778361 is about 52161.0809032942. The cubic root of 2720778361 is about 1396.0395485343.

The spelling of 2720778361 in words is "two billion, seven hundred twenty million, seven hundred seventy-eight thousand, three hundred sixty-one".