678155823 has 12 divisors (see below), whose sum is σ = 1037179728. Its totient is φ = 425509440.

The previous prime is 678155813. The next prime is 678155837. The reversal of 678155823 is 328551876.

678155823 is a `hidden beast` number, since 6 + 78 + 1 + 558 + 23 = 666.

It is not a de Polignac number, because 678155823 - 2²⁰ = 677107247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678155813) 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 11 ways as a sum of consecutive naturals, for example, 2216043 + ... + 2216348.

It is an arithmetic number, because the mean of its divisors is an integer number (86431644).

Almost surely, 2^678155823 is an apocalyptic number.

678155823 is a deficient number, since it is larger than the sum of its proper divisors (359023905).

678155823 is a wasteful number, since it uses less digits than its factorization.

678155823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432414 (or 4432411 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 678155823 is about 26041.4251338132. The cubic root of 678155823 is about 878.5702605690.

The spelling of 678155823 in words is "six hundred seventy-eight million, one hundred fifty-five thousand, eight hundred twenty-three".