78457097 has 2 divisors, whose sum is σ = 78457098. Its totient is φ = 78457096.

The previous prime is 78457081. The next prime is 78457109. The reversal of 78457097 is 79075487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67059721 + 11397376 = 8189^2 + 3376^2 .

It is a cyclic number.

It is not a de Polignac number, because 78457097 - 2⁴ = 78457081 is a prime.

It is not a weakly prime, because it can be changed into another prime (78457007) 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, 39228548 + 39228549.

It is an arithmetic number, because the mean of its divisors is an integer number (39228549).

Almost surely, 2^78457097 is an apocalyptic number.

It is an amenable number.

78457097 is a deficient number, since it is larger than the sum of its proper divisors (1).

78457097 is an equidigital number, since it uses as much as digits as its factorization.

78457097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 78457097 is about 8857.6010860729. The cubic root of 78457097 is about 428.0988668013.

The spelling of 78457097 in words is "seventy-eight million, four hundred fifty-seven thousand, ninety-seven".