2777720945 has 8 divisors (see below), whose sum is σ = 3333600360. Its totient is φ = 2221953280.

The previous prime is 2777720927. The next prime is 2777720947. The reversal of 2777720945 is 5490277772.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15272464 + 2762448481 = 3908^2 + 52559^2 .

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

It is not a de Polignac number, because 2777720945 - 2¹⁴ = 2777704561 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2777720893 and 2777720902.

It is not an unprimeable number, because it can be changed into a prime (2777720947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43241 + ... + 86169.

It is an arithmetic number, because the mean of its divisors is an integer number (416700045).

Almost surely, 2^2777720945 is an apocalyptic number.

It is an amenable number.

2777720945 is a deficient number, since it is larger than the sum of its proper divisors (555879415).

2777720945 is a wasteful number, since it uses less digits than its factorization.

2777720945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55875.

The product of its (nonzero) digits is 1728720, while the sum is 50.

The square root of 2777720945 is about 52704.0885036446. The cubic root of 2777720945 is about 1405.7115218466.

The spelling of 2777720945 in words is "two billion, seven hundred seventy-seven million, seven hundred twenty thousand, nine hundred forty-five".