78645373 has 2 divisors, whose sum is σ = 78645374. Its totient is φ = 78645372.

The previous prime is 78645331. The next prime is 78645379. The reversal of 78645373 is 37354687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44796249 + 33849124 = 6693^2 + 5818^2 .

It is an emirp because it is prime and its reverse (37354687) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78645373 is a prime.

It is equal to p_4594948 and since 78645373 and 4594948 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78645379) 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, 39322686 + 39322687.

It is an arithmetic number, because the mean of its divisors is an integer number (39322687).

Almost surely, 2^78645373 is an apocalyptic number.

It is an amenable number.

78645373 is a deficient number, since it is larger than the sum of its proper divisors (1).

78645373 is an equidigital number, since it uses as much as digits as its factorization.

78645373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 43.

The square root of 78645373 is about 8868.2226516930. Note that the first 3 decimals coincide. The cubic root of 78645373 is about 428.4410340823.

The spelling of 78645373 in words is "seventy-eight million, six hundred forty-five thousand, three hundred seventy-three".