656790 has 16 divisors (see below), whose sum is σ = 1576368. Its totient is φ = 175136.

The previous prime is 656783. The next prime is 656791. The reversal of 656790 is 97656.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656791) 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, 10917 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (98523).

656790 is a Friedman number, since it can be written as 6*(90+7*5^6), using all its digits and the basic arithmetic operations.

2⁶⁵⁶⁷⁹⁰ is an apocalyptic number.

656790 is an abundant number, since it is smaller than the sum of its proper divisors (919578).

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

656790 is a wasteful number, since it uses less digits than its factorization.

656790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21903.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 656790 is about 810.4258140015. The cubic root of 656790 is about 86.9244951987.

The spelling of 656790 in words is "six hundred fifty-six thousand, seven hundred ninety".