656890 has 32 divisors (see below), whose sum is σ = 1322496. Its totient is φ = 233280.

The previous prime is 656839. The next prime is 656891. The reversal of 656890 is 98656.

656890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×656890³ = 850352918033307000, which contains 333 as substring.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (656891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3949 + ... + 4111.

It is an arithmetic number, because the mean of its divisors is an integer number (41328).

2⁶⁵⁶⁸⁹⁰ is an apocalyptic number.

656890 is an abundant number, since it is smaller than the sum of its proper divisors (665606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656890 is a wasteful number, since it uses less digits than its factorization.

656890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 656890 is about 810.4875076150. The cubic root of 656890 is about 86.9289065571.

The spelling of 656890 in words is "six hundred fifty-six thousand, eight hundred ninety".