77778713 has 2 divisors, whose sum is σ = 77778714. Its totient is φ = 77778712.

The previous prime is 77778707. The next prime is 77778731. The reversal of 77778713 is 31787777.

It is a happy number.

Together with next prime (77778731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49603849 + 28174864 = 7043^2 + 5308^2 .

It is a cyclic number.

It is not a de Polignac number, because 77778713 - 2¹⁴ = 77762329 is a prime.

It is not a weakly prime, because it can be changed into another prime (77778703) 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 as a sum of consecutive naturals, namely, 38889356 + 38889357.

It is an arithmetic number, because the mean of its divisors is an integer number (38889357).

Almost surely, 2^77778713 is an apocalyptic number.

It is an amenable number.

77778713 is a deficient number, since it is larger than the sum of its proper divisors (1).

77778713 is an equidigital number, since it uses as much as digits as its factorization.

77778713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403368, while the sum is 47.

The square root of 77778713 is about 8819.2240588387. The cubic root of 77778713 is about 426.8614325501.

The spelling of 77778713 in words is "seventy-seven million, seven hundred seventy-eight thousand, seven hundred thirteen".