256215106 has 16 divisors (see below), whose sum is σ = 439729920. Its totient is φ = 109680480.

The previous prime is 256215097. The next prime is 256215149. The reversal of 256215106 is 601512652.

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, 2710 + ... + 22798.

It is an arithmetic number, because the mean of its divisors is an integer number (27483120).

Almost surely, 2^256215106 is an apocalyptic number.

256215106 is a deficient number, since it is larger than the sum of its proper divisors (183514814).

256215106 is a wasteful number, since it uses less digits than its factorization.

256215106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21009.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 256215106 is about 16006.7206510266. The cubic root of 256215106 is about 635.1382144838.

Adding to 256215106 its reverse (601512652), we get a palindrome (857727758).

The spelling of 256215106 in words is "two hundred fifty-six million, two hundred fifteen thousand, one hundred six".