78457693 has 2 divisors, whose sum is σ = 78457694. Its totient is φ = 78457692.

The previous prime is 78457681. The next prime is 78457739. The reversal of 78457693 is 39675487.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77757124 + 700569 = 8818^2 + 837^2 .

It is an emirp because it is prime and its reverse (39675487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78457693 - 2⁵ = 78457661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78457633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39228846 + 39228847.

It is an arithmetic number, because the mean of its divisors is an integer number (39228847).

Almost surely, 2^78457693 is an apocalyptic number.

It is an amenable number.

78457693 is a deficient number, since it is larger than the sum of its proper divisors (1).

78457693 is an equidigital number, since it uses as much as digits as its factorization.

78457693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The square root of 78457693 is about 8857.6347294297. The cubic root of 78457693 is about 428.0999508174.

The spelling of 78457693 in words is "seventy-eight million, four hundred fifty-seven thousand, six hundred ninety-three".