78800017 has 2 divisors, whose sum is σ = 78800018. Its totient is φ = 78800016.

The previous prime is 78799997. The next prime is 78800021. The reversal of 78800017 is 71000887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78783376 + 16641 = 8876^2 + 129^2 .

It is a cyclic number.

It is not a de Polignac number, because 78800017 - 2¹¹ = 78797969 is a prime.

It is not a weakly prime, because it can be changed into another prime (78800077) 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, 39400008 + 39400009.

It is an arithmetic number, because the mean of its divisors is an integer number (39400009).

Almost surely, 2^78800017 is an apocalyptic number.

It is an amenable number.

78800017 is a deficient number, since it is larger than the sum of its proper divisors (1).

78800017 is an equidigital number, since it uses as much as digits as its factorization.

78800017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 78800017 is about 8876.9373660064. The cubic root of 78800017 is about 428.7216712973.

The spelling of 78800017 in words is "seventy-eight million, eight hundred thousand, seventeen".