78327797 has 2 divisors, whose sum is σ = 78327798. Its totient is φ = 78327796.

The previous prime is 78327701. The next prime is 78327817. The reversal of 78327797 is 79772387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77598481 + 729316 = 8809^2 + 854^2 .

It is a cyclic number.

It is not a de Polignac number, because 78327797 - 2⁸ = 78327541 is a prime.

It is a super-2 number, since 2×78327797² = 12270487565746418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78327497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39163898 + 39163899.

It is an arithmetic number, because the mean of its divisors is an integer number (39163899).

Almost surely, 2^78327797 is an apocalyptic number.

It is an amenable number.

78327797 is a deficient number, since it is larger than the sum of its proper divisors (1).

78327797 is an equidigital number, since it uses as much as digits as its factorization.

78327797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1037232, while the sum is 50.

The square root of 78327797 is about 8850.2992604770. The cubic root of 78327797 is about 427.8635635955.

The spelling of 78327797 in words is "seventy-eight million, three hundred twenty-seven thousand, seven hundred ninety-seven".