78453493 has 2 divisors, whose sum is σ = 78453494. Its totient is φ = 78453492.

The previous prime is 78453491. The next prime is 78453499. The reversal of 78453493 is 39435487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75637809 + 2815684 = 8697^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 78453493 - 2¹ = 78453491 is a prime.

Together with 78453491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78453491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39226746 + 39226747.

It is an arithmetic number, because the mean of its divisors is an integer number (39226747).

Almost surely, 2^78453493 is an apocalyptic number.

It is an amenable number.

78453493 is a deficient number, since it is larger than the sum of its proper divisors (1).

78453493 is an equidigital number, since it uses as much as digits as its factorization.

78453493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 43.

The square root of 78453493 is about 8857.3976426488. The cubic root of 78453493 is about 428.0923116606.

The spelling of 78453493 in words is "seventy-eight million, four hundred fifty-three thousand, four hundred ninety-three".