777765313 has 8 divisors (see below), whose sum is σ = 838615400. Its totient is φ = 717061248.

The previous prime is 777765299. The next prime is 777765337. The reversal of 777765313 is 313567777.

777765313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 861184 + 776904129 = 928^2 + 27873^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-777765313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (777765343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25308 + ... + 46861.

It is an arithmetic number, because the mean of its divisors is an integer number (104826925).

Almost surely, 2^777765313 is an apocalyptic number.

It is an amenable number.

777765313 is a deficient number, since it is larger than the sum of its proper divisors (60850087).

777765313 is a wasteful number, since it uses less digits than its factorization.

777765313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73011.

The product of its digits is 648270, while the sum is 46.

The square root of 777765313 is about 27888.4440763554. Note that the first 3 decimals coincide. The cubic root of 777765313 is about 919.6364793327.

The spelling of 777765313 in words is "seven hundred seventy-seven million, seven hundred sixty-five thousand, three hundred thirteen".