655878 has 8 divisors (see below), whose sum is σ = 1311768. Its totient is φ = 218624.

The previous prime is 655859. The next prime is 655883. The reversal of 655878 is 878556.

It is a happy number.

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

655878 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655878.

It is an unprimeable number.

655878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54651 + ... + 54662.

It is an arithmetic number, because the mean of its divisors is an integer number (163971).

2⁶⁵⁵⁸⁷⁸ is an apocalyptic number.

655878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

655878 is a wasteful number, since it uses less digits than its factorization.

655878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109318.

The product of its digits is 67200, while the sum is 39.

The square root of 655878 is about 809.8629513689. The cubic root of 655878 is about 86.8842429308.

The spelling of 655878 in words is "six hundred fifty-five thousand, eight hundred seventy-eight".