655779 has 8 divisors (see below), whose sum is σ = 885760. Its totient is φ = 431496.

The previous prime is 655757. The next prime is 655807. The reversal of 655779 is 977556.

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

It is not a de Polignac number, because 655779 - 2⁷ = 655651 is a prime.

It is a Duffinian number.

655779 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (655379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1147 + ... + 1620.

It is an arithmetic number, because the mean of its divisors is an integer number (110720).

2⁶⁵⁵⁷⁷⁹ is an apocalyptic number.

655779 is a deficient number, since it is larger than the sum of its proper divisors (229981).

655779 is a wasteful number, since it uses less digits than its factorization.

655779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2849.

The product of its digits is 66150, while the sum is 39.

The square root of 655779 is about 809.8018276097. The cubic root of 655779 is about 86.8798711966.

The spelling of 655779 in words is "six hundred fifty-five thousand, seven hundred seventy-nine".