221794656 has 48 divisors (see below), whose sum is σ = 590917824. Its totient is φ = 72825984.

The previous prime is 221794649. The next prime is 221794667. The reversal of 221794656 is 656497122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10810 + ... + 23673.

It is an arithmetic number, because the mean of its divisors is an integer number (12310788).

Almost surely, 2^221794656 is an apocalyptic number.

It is an amenable number.

221794656 is an abundant number, since it is smaller than the sum of its proper divisors (369123168).

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

221794656 is a wasteful number, since it uses less digits than its factorization.

221794656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34563 (or 34555 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 221794656 is about 14892.7719380913. The cubic root of 221794656 is about 605.3181451723.

The spelling of 221794656 in words is "two hundred twenty-one million, seven hundred ninety-four thousand, six hundred fifty-six".