78605069 has 2 divisors, whose sum is σ = 78605070. Its totient is φ = 78605068.

The previous prime is 78605041. The next prime is 78605081. The reversal of 78605069 is 96050687.

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., 69973225 + 8631844 = 8365^2 + 2938^2 .

It is an emirp because it is prime and its reverse (96050687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78605069 - 2¹⁶ = 78539533 is a prime.

It is a super-2 number, since 2×78605069² = 12357513744989522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78605029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39302534 + 39302535.

It is an arithmetic number, because the mean of its divisors is an integer number (39302535).

Almost surely, 2^78605069 is an apocalyptic number.

It is an amenable number.

78605069 is a deficient number, since it is larger than the sum of its proper divisors (1).

78605069 is an equidigital number, since it uses as much as digits as its factorization.

78605069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 78605069 is about 8865.9499773008. The cubic root of 78605069 is about 428.3678327507.

The spelling of 78605069 in words is "seventy-eight million, six hundred five thousand, sixty-nine".