77789069 has 2 divisors, whose sum is σ = 77789070. Its totient is φ = 77789068.

The previous prime is 77789039. The next prime is 77789083. The reversal of 77789069 is 96098777.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47955625 + 29833444 = 6925^2 + 5462^2 .

It is a cyclic number.

It is not a de Polignac number, because 77789069 - 2⁸ = 77788813 is a prime.

It is a super-2 number, since 2×77789069² = 12102278511773522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77789069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77789029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38894534 + 38894535.

It is an arithmetic number, because the mean of its divisors is an integer number (38894535).

Almost surely, 2^77789069 is an apocalyptic number.

It is an amenable number.

77789069 is a deficient number, since it is larger than the sum of its proper divisors (1).

77789069 is an equidigital number, since it uses as much as digits as its factorization.

77789069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 77789069 is about 8819.8111657790. The cubic root of 77789069 is about 426.8803768115.

The spelling of 77789069 in words is "seventy-seven million, seven hundred eighty-nine thousand, sixty-nine".