256215210 has 16 divisors (see below), whose sum is σ = 614916576. Its totient is φ = 68324048.

The previous prime is 256215163. The next prime is 256215233. The reversal of 256215210 is 12512652.

It is a happy number.

It is a Curzon 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, 4270224 + ... + 4270283.

It is an arithmetic number, because the mean of its divisors is an integer number (38432286).

Almost surely, 2^256215210 is an apocalyptic number.

256215210 is an abundant number, since it is smaller than the sum of its proper divisors (358701366).

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

256215210 is a wasteful number, since it uses less digits than its factorization.

256215210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8540517.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 256215210 is about 16006.7238996617. The cubic root of 256215210 is about 635.1383004199.

Adding to 256215210 its reverse (12512652), we get a palindrome (268727862).

The spelling of 256215210 in words is "two hundred fifty-six million, two hundred fifteen thousand, two hundred ten".