78641077 has 2 divisors, whose sum is σ = 78641078. Its totient is φ = 78641076.

The previous prime is 78641051. The next prime is 78641081. The reversal of 78641077 is 77014687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76720081 + 1920996 = 8759^2 + 1386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78641077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78641377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39320538 + 39320539.

It is an arithmetic number, because the mean of its divisors is an integer number (39320539).

Almost surely, 2^78641077 is an apocalyptic number.

It is an amenable number.

78641077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78641077 is an equidigital number, since it uses as much as digits as its factorization.

78641077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 40.

The square root of 78641077 is about 8867.9804352513. The cubic root of 78641077 is about 428.4332327495.

The spelling of 78641077 in words is "seventy-eight million, six hundred forty-one thousand, seventy-seven".