256221796 has 6 divisors (see below), whose sum is σ = 448388150. Its totient is φ = 128110896.

The previous prime is 256221787. The next prime is 256221827. The reversal of 256221796 is 697122652.

256221796 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 255680100 + 541696 = 15990^2 + 736^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32027721 + ... + 32027728.

Almost surely, 2^256221796 is an apocalyptic number.

It is an amenable number.

256221796 is a deficient number, since it is larger than the sum of its proper divisors (192166354).

256221796 is a wasteful number, since it uses less digits than its factorization.

256221796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64055453 (or 64055451 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 256221796 is about 16006.9296243846. The cubic root of 256221796 is about 635.1437424400.

The spelling of 256221796 in words is "two hundred fifty-six million, two hundred twenty-one thousand, seven hundred ninety-six".