78365069 has 2 divisors, whose sum is σ = 78365070. Its totient is φ = 78365068.

The previous prime is 78365057. The next prime is 78365081. The reversal of 78365069 is 96056387.

It is a balanced prime because it is at equal distance from previous prime (78365057) and next prime (78365081).

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 131044 = 8845^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 78365069 - 2²⁴ = 61587853 is a prime.

It is a super-2 number, since 2×78365069² = 12282168078749522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78365029) 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, 39182534 + 39182535.

It is an arithmetic number, because the mean of its divisors is an integer number (39182535).

Almost surely, 2^78365069 is an apocalyptic number.

It is an amenable number.

78365069 is a deficient number, since it is larger than the sum of its proper divisors (1).

78365069 is an equidigital number, since it uses as much as digits as its factorization.

78365069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 78365069 is about 8852.4047015486. The cubic root of 78365069 is about 427.9314186122.

The spelling of 78365069 in words is "seventy-eight million, three hundred sixty-five thousand, sixty-nine".