656679 has 8 divisors (see below), whose sum is σ = 888192. Its totient is φ = 431480.

The previous prime is 656671. The next prime is 656681. The reversal of 656679 is 976656.

656679 = T₁₆ + T₁₇ + ... + T₁₅₇.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 656679 - 2³ = 656671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329 + ... + 1754.

It is an arithmetic number, because the mean of its divisors is an integer number (111024).

2⁶⁵⁶⁶⁷⁹ is an apocalyptic number.

656679 is a deficient number, since it is larger than the sum of its proper divisors (231513).

656679 is a wasteful number, since it uses less digits than its factorization.

656679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157.

The product of its digits is 68040, while the sum is 39.

The square root of 656679 is about 810.3573285903. The cubic root of 656679 is about 86.9195980664.

The spelling of 656679 in words is "six hundred fifty-six thousand, six hundred seventy-nine".