678808877 has 6 divisors (see below), whose sum is σ = 716416398. Its totient is φ = 643081752.

The previous prime is 678808859. The next prime is 678808909. The reversal of 678808877 is 778808876.

It can be written as a sum of positive squares in only one way, i.e., 563160361 + 115648516 = 23731^2 + 10754^2 .

It is not a de Polignac number, because 678808877 - 2¹⁰ = 678807853 is a prime.

It is a super-2 number, since 2×678808877² = 921562982988002258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678808807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 939818 + ... + 940539.

It is an arithmetic number, because the mean of its divisors is an integer number (119402733).

Almost surely, 2^678808877 is an apocalyptic number.

It is an amenable number.

678808877 is a deficient number, since it is larger than the sum of its proper divisors (37607521).

678808877 is a wasteful number, since it uses less digits than its factorization.

678808877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880395 (or 1880376 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 59.

The square root of 678808877 is about 26053.9608697027. The cubic root of 678808877 is about 878.8521868018.

Subtracting 678808877 from its reverse (778808876), we obtain a palindrome (99999999).

The spelling of 678808877 in words is "six hundred seventy-eight million, eight hundred eight thousand, eight hundred seventy-seven".