656867 has 4 divisors (see below), whose sum is σ = 659736. Its totient is φ = 654000.

The previous prime is 656839. The next prime is 656891. The reversal of 656867 is 768656.

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

It is a cyclic number.

It is not a de Polignac number, because 656867 - 2¹⁴ = 640483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 656867.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 656867.

It is not an unprimeable number, because it can be changed into a prime (656267) 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, 1058 + ... + 1559.

It is an arithmetic number, because the mean of its divisors is an integer number (164934).

2⁶⁵⁶⁸⁶⁷ is an apocalyptic number.

656867 is a deficient number, since it is larger than the sum of its proper divisors (2869).

656867 is a wasteful number, since it uses less digits than its factorization.

656867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868.

The product of its digits is 60480, while the sum is 38.

The square root of 656867 is about 810.4733184998. The cubic root of 656867 is about 86.9278919843.

The spelling of 656867 in words is "six hundred fifty-six thousand, eight hundred sixty-seven".