78494357 has 2 divisors, whose sum is σ = 78494358. Its totient is φ = 78494356.

The previous prime is 78494341. The next prime is 78494369. The reversal of 78494357 is 75349487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63856081 + 14638276 = 7991^2 + 3826^2 .

It is an emirp because it is prime and its reverse (75349487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78494357 - 2⁴ = 78494341 is a prime.

It is a super-2 number, since 2×78494357² = 12322728161686898, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78494657) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39247178 + 39247179.

It is an arithmetic number, because the mean of its divisors is an integer number (39247179).

Almost surely, 2^78494357 is an apocalyptic number.

It is an amenable number.

78494357 is a deficient number, since it is larger than the sum of its proper divisors (1).

78494357 is an equidigital number, since it uses as much as digits as its factorization.

78494357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 47.

The square root of 78494357 is about 8859.7041146982. The cubic root of 78494357 is about 428.1666254446.

The spelling of 78494357 in words is "seventy-eight million, four hundred ninety-four thousand, three hundred fifty-seven".