78061769 has 2 divisors, whose sum is σ = 78061770. Its totient is φ = 78061768.

The previous prime is 78061741. The next prime is 78061787. The reversal of 78061769 is 96716087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76825225 + 1236544 = 8765^2 + 1112^2 .

It is a cyclic number.

It is not a de Polignac number, because 78061769 - 2⁸ = 78061513 is a prime.

It is a super-2 number, since 2×78061769² = 12187279558818722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78061729) 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, 39030884 + 39030885.

It is an arithmetic number, because the mean of its divisors is an integer number (39030885).

Almost surely, 2^78061769 is an apocalyptic number.

It is an amenable number.

78061769 is a deficient number, since it is larger than the sum of its proper divisors (1).

78061769 is an equidigital number, since it uses as much as digits as its factorization.

78061769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 78061769 is about 8835.2571552842. The cubic root of 78061769 is about 427.3786238186.

The spelling of 78061769 in words is "seventy-eight million, sixty-one thousand, seven hundred sixty-nine".