256220346 has 16 divisors (see below), whose sum is σ = 512604000. Its totient is φ = 85379568.

The previous prime is 256220333. The next prime is 256220347. The reversal of 256220346 is 643022652.

It is not an unprimeable number, because it can be changed into a prime (256220347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25105 + ... + 33803.

It is an arithmetic number, because the mean of its divisors is an integer number (32037750).

Almost surely, 2^256220346 is an apocalyptic number.

256220346 is an abundant number, since it is smaller than the sum of its proper divisors (256383654).

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

256220346 is a wasteful number, since it uses less digits than its factorization.

256220346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13613.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 256220346 is about 16006.8843314369. The cubic root of 256220346 is about 635.1425443112.

Adding to 256220346 its reverse (643022652), we get a palindrome (899242998).

The spelling of 256220346 in words is "two hundred fifty-six million, two hundred twenty thousand, three hundred forty-six".