678780055 has 8 divisors (see below), whose sum is σ = 815310144. Its totient is φ = 542508000.

The previous prime is 678780043. The next prime is 678780077. The reversal of 678780055 is 550087876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 678780055 - 2¹⁷ = 678648983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678779987 and 678780014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58671 + ... + 69280.

It is an arithmetic number, because the mean of its divisors is an integer number (101913768).

Almost surely, 2^678780055 is an apocalyptic number.

678780055 is a deficient number, since it is larger than the sum of its proper divisors (136530089).

678780055 is a wasteful number, since it uses less digits than its factorization.

678780055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129017.

The product of its (nonzero) digits is 470400, while the sum is 46.

The square root of 678780055 is about 26053.4077425584. The cubic root of 678780055 is about 878.8397480348.

The spelling of 678780055 in words is "six hundred seventy-eight million, seven hundred eighty thousand, fifty-five".