678870557 has 4 divisors (see below), whose sum is σ = 679091196. Its totient is φ = 678649920.

The previous prime is 678870473. The next prime is 678870559. The reversal of 678870557 is 755078876.

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

It can be written as a sum of positive squares in 2 ways, for example, as 320374201 + 358496356 = 17899^2 + 18934^2 .

It is a cyclic number.

It is not a de Polignac number, because 678870557 - 2²² = 674676253 is a prime.

It is a super-2 number, since 2×678870557² = 921730466322980498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678870499 and 678870508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678870559) 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, 105638 + ... + 111879.

It is an arithmetic number, because the mean of its divisors is an integer number (169772799).

Almost surely, 2^678870557 is an apocalyptic number.

It is an amenable number.

678870557 is a deficient number, since it is larger than the sum of its proper divisors (220639).

678870557 is a wasteful number, since it uses less digits than its factorization.

678870557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220638.

The product of its (nonzero) digits is 3292800, while the sum is 53.

The square root of 678870557 is about 26055.1445399944. The cubic root of 678870557 is about 878.8788049771.

The spelling of 678870557 in words is "six hundred seventy-eight million, eight hundred seventy thousand, five hundred fifty-seven".