256221546 has 32 divisors (see below), whose sum is σ = 599937408. Its totient is φ = 71420160.

The previous prime is 256221521. The next prime is 256221551. The reversal of 256221546 is 645122652.

256221546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72675 + ... + 76118.

It is an arithmetic number, because the mean of its divisors is an integer number (18748044).

Almost surely, 2^256221546 is an apocalyptic number.

256221546 is an abundant number, since it is smaller than the sum of its proper divisors (343715862).

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

256221546 is a wasteful number, since it uses less digits than its factorization.

256221546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148846.

The product of its digits is 28800, while the sum is 33.

The square root of 256221546 is about 16006.9218152648. The cubic root of 256221546 is about 635.1435358664.

The spelling of 256221546 in words is "two hundred fifty-six million, two hundred twenty-one thousand, five hundred forty-six".