655769 has 4 divisors (see below), whose sum is σ = 668196. Its totient is φ = 643344.

The previous prime is 655757. The next prime is 655807. The reversal of 655769 is 967556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 405769 + 250000 = 637^2 + 500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655769 is a prime.

It is a super-2 number, since 2×655769² = 860065962722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655069) 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 3 ways as a sum of consecutive naturals, for example, 6134 + ... + 6239.

It is an arithmetic number, because the mean of its divisors is an integer number (167049).

2⁶⁵⁵⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

655769 is a deficient number, since it is larger than the sum of its proper divisors (12427).

655769 is a wasteful number, since it uses less digits than its factorization.

655769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12426.

The product of its digits is 56700, while the sum is 38.

The square root of 655769 is about 809.7956532360. The cubic root of 655769 is about 86.8794295828.

The spelling of 655769 in words is "six hundred fifty-five thousand, seven hundred sixty-nine".