655679 has 4 divisors (see below), whose sum is σ = 657384. Its totient is φ = 653976.

The previous prime is 655657. The next prime is 655687. The reversal of 655679 is 976556.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29 + ... + 1145.

It is an arithmetic number, because the mean of its divisors is an integer number (164346).

2⁶⁵⁵⁶⁷⁹ is an apocalyptic number.

655679 is a deficient number, since it is larger than the sum of its proper divisors (1705).

655679 is a wasteful number, since it uses less digits than its factorization.

655679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704.

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

The square root of 655679 is about 809.7400817546. The cubic root of 655679 is about 86.8754548568.

The spelling of 655679 in words is "six hundred fifty-five thousand, six hundred seventy-nine".