2728780977 has 12 divisors (see below), whose sum is σ = 3939779184. Its totient is φ = 1679249520.

The previous prime is 2728780963. The next prime is 2728780979. The reversal of 2728780977 is 7790878272.

It is not a de Polignac number, because 2728780977 - 2⁴ = 2728780961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2728780979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2690599 + ... + 2691612.

It is an arithmetic number, because the mean of its divisors is an integer number (328314932).

Almost surely, 2^2728780977 is an apocalyptic number.

It is an amenable number.

2728780977 is a deficient number, since it is larger than the sum of its proper divisors (1210998207).

2728780977 is a wasteful number, since it uses less digits than its factorization.

2728780977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382240 (or 5382227 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 57.

The square root of 2728780977 is about 52237.7351825287. The cubic root of 2728780977 is about 1397.4069308851.

The spelling of 2728780977 in words is "two billion, seven hundred twenty-eight million, seven hundred eighty thousand, nine hundred seventy-seven".