256620216 has 64 divisors (see below), whose sum is σ = 660844800. Its totient is φ = 82994688.

The previous prime is 256620211. The next prime is 256620233. The reversal of 256620216 is 612026652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256620211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171600 + ... + 173088.

It is an arithmetic number, because the mean of its divisors is an integer number (10325700).

Almost surely, 2^256620216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256620216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330422400).

256620216 is an abundant number, since it is smaller than the sum of its proper divisors (404224584).

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

256620216 is a wasteful number, since it uses less digits than its factorization.

256620216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708 (or 1704 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 256620216 is about 16019.3700250665. The cubic root of 256620216 is about 635.4727840780.

Adding to 256620216 its reverse (612026652), we get a palindrome (868646868).

The spelling of 256620216 in words is "two hundred fifty-six million, six hundred twenty thousand, two hundred sixteen".