678719677 has 4 divisors (see below), whose sum is σ = 678805120. Its totient is φ = 678634236.

The previous prime is 678719669. The next prime is 678719707. The reversal of 678719677 is 776917876.

678719677 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 678719677 - 2³ = 678719669 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 (678719647) 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, 29427 + ... + 47152.

It is an arithmetic number, because the mean of its divisors is an integer number (169701280).

Almost surely, 2^678719677 is an apocalyptic number.

It is an amenable number.

678719677 is a deficient number, since it is larger than the sum of its proper divisors (85443).

678719677 is an equidigital number, since it uses as much as digits as its factorization.

678719677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85442.

The product of its digits is 6223392, while the sum is 58.

The square root of 678719677 is about 26052.2489816139. The cubic root of 678719677 is about 878.8136894418.

The spelling of 678719677 in words is "six hundred seventy-eight million, seven hundred nineteen thousand, six hundred seventy-seven".