256161216 has 56 divisors (see below), whose sum is σ = 679321984. Its totient is φ = 85190400.

The previous prime is 256161203. The next prime is 256161221. The reversal of 256161216 is 612161652.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 99141 + ... + 101691.

Almost surely, 2^256161216 is an apocalyptic number.

It is an amenable number.

256161216 is an abundant number, since it is smaller than the sum of its proper divisors (423160768).

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

256161216 is a wasteful number, since it uses less digits than its factorization.

256161216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3089 (or 3079 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 256161216 is about 16005.0372070795. The cubic root of 256161216 is about 635.0936815925.

The spelling of 256161216 in words is "two hundred fifty-six million, one hundred sixty-one thousand, two hundred sixteen".