77785349 has 2 divisors, whose sum is σ = 77785350. Its totient is φ = 77785348.

The previous prime is 77785327. The next prime is 77785381. The reversal of 77785349 is 94358777.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49801249 + 27984100 = 7057^2 + 5290^2 .

It is a cyclic number.

It is not a de Polignac number, because 77785349 - 2²⁰ = 76736773 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77785297 and 77785306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77785249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38892674 + 38892675.

It is an arithmetic number, because the mean of its divisors is an integer number (38892675).

Almost surely, 2^77785349 is an apocalyptic number.

It is an amenable number.

77785349 is a deficient number, since it is larger than the sum of its proper divisors (1).

77785349 is an equidigital number, since it uses as much as digits as its factorization.

77785349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 50.

The square root of 77785349 is about 8819.6002743889. The cubic root of 77785349 is about 426.8735719980.

The spelling of 77785349 in words is "seventy-seven million, seven hundred eighty-five thousand, three hundred forty-nine".