678772513 has 4 divisors (see below), whose sum is σ = 679093168. Its totient is φ = 678451860.

The previous prime is 678772499. The next prime is 678772517. The reversal of 678772513 is 315277876.

678772513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678772513 - 2²⁵ = 645218081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678772517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157131 + ... + 161392.

It is an arithmetic number, because the mean of its divisors is an integer number (169773292).

Almost surely, 2^678772513 is an apocalyptic number.

It is an amenable number.

678772513 is a deficient number, since it is larger than the sum of its proper divisors (320655).

678772513 is a wasteful number, since it uses less digits than its factorization.

678772513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320654.

The product of its digits is 493920, while the sum is 46.

The square root of 678772513 is about 26053.2630010139. The cubic root of 678772513 is about 878.8364930610.

The spelling of 678772513 in words is "six hundred seventy-eight million, seven hundred seventy-two thousand, five hundred thirteen".