678765655 has 16 divisors (see below), whose sum is σ = 823040064. Its totient is φ = 537361920.

The previous prime is 678765623. The next prime is 678765679. The reversal of 678765655 is 556567876.

It is not a de Polignac number, because 678765655 - 2⁵ = 678765623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678765596 and 678765605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199549 + ... + 202921.

It is an arithmetic number, because the mean of its divisors is an integer number (51440004).

Almost surely, 2^678765655 is an apocalyptic number.

678765655 is a deficient number, since it is larger than the sum of its proper divisors (144274409).

678765655 is a wasteful number, since it uses less digits than its factorization.

678765655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786.

The product of its digits is 10584000, while the sum is 55.

The square root of 678765655 is about 26053.1313856895. The cubic root of 678765655 is about 878.8335332667.

The spelling of 678765655 in words is "six hundred seventy-eight million, seven hundred sixty-five thousand, six hundred fifty-five".