5778766721 has 32 divisors (see below), whose sum is σ = 7434567168. Its totient is φ = 4365757440.

The previous prime is 5778766717. The next prime is 5778766733. The reversal of 5778766721 is 1276678775.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5778766721 - 2² = 5778766717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5778766121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1381385 + ... + 1385561.

It is an arithmetic number, because the mean of its divisors is an integer number (232330224).

Almost surely, 2^5778766721 is an apocalyptic number.

It is an amenable number.

5778766721 is a deficient number, since it is larger than the sum of its proper divisors (1655800447).

5778766721 is a wasteful number, since it uses less digits than its factorization.

5778766721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4881.

The product of its digits is 6914880, while the sum is 56.

The square root of 5778766721 is about 76018.1999326477. The cubic root of 5778766721 is about 1794.5065768736.

The spelling of 5778766721 in words is "five billion, seven hundred seventy-eight million, seven hundred sixty-six thousand, seven hundred twenty-one".