678320503 has 4 divisors (see below), whose sum is σ = 775223440. Its totient is φ = 581417568.

The previous prime is 678320477. The next prime is 678320537. The reversal of 678320503 is 305023876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678320503 - 2²¹ = 676223351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678320543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48451458 + ... + 48451471.

It is an arithmetic number, because the mean of its divisors is an integer number (193805860).

Almost surely, 2^678320503 is an apocalyptic number.

678320503 is a deficient number, since it is larger than the sum of its proper divisors (96902937).

678320503 is an equidigital number, since it uses as much as digits as its factorization.

678320503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96902936.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 678320503 is about 26044.5868272085. The cubic root of 678320503 is about 878.6413706963.

The spelling of 678320503 in words is "six hundred seventy-eight million, three hundred twenty thousand, five hundred three".