656678 has 16 divisors (see below), whose sum is σ = 1131840. Its totient is φ = 282600.

The previous prime is 656671. The next prime is 656681. The reversal of 656678 is 876656.

It is a super-3 number, since 3×656678³ = 849529873181333256, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

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 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, 368 + ... + 1203.

It is an arithmetic number, because the mean of its divisors is an integer number (70740).

2⁶⁵⁶⁶⁷⁸ is an apocalyptic number.

656678 is a deficient number, since it is larger than the sum of its proper divisors (475162).

656678 is a wasteful number, since it uses less digits than its factorization.

656678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603.

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

The square root of 656678 is about 810.3567115783. The cubic root of 656678 is about 86.9195539455.

The spelling of 656678 in words is "six hundred fifty-six thousand, six hundred seventy-eight".