78456503 has 2 divisors, whose sum is σ = 78456504. Its totient is φ = 78456502.

The previous prime is 78456487. The next prime is 78456509. The reversal of 78456503 is 30565487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78456503 - 2⁴ = 78456487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78456509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39228251 + 39228252.

It is an arithmetic number, because the mean of its divisors is an integer number (39228252).

Almost surely, 2^78456503 is an apocalyptic number.

78456503 is a deficient number, since it is larger than the sum of its proper divisors (1).

78456503 is an equidigital number, since it uses as much as digits as its factorization.

78456503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 78456503 is about 8857.5675554861. The cubic root of 78456503 is about 428.0977864173.

The spelling of 78456503 in words is "seventy-eight million, four hundred fifty-six thousand, five hundred three".