256623216 has 20 divisors (see below), whose sum is σ = 662943432. Its totient is φ = 85541056.

The previous prime is 256623209. The next prime is 256623217. The reversal of 256623216 is 612326652.

256623216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256623217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2673111 + ... + 2673206.

Almost surely, 2^256623216 is an apocalyptic number.

It is an amenable number.

256623216 is an abundant number, since it is smaller than the sum of its proper divisors (406320216).

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

256623216 is a wasteful number, since it uses less digits than its factorization.

256623216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346328 (or 5346322 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 256623216 is about 16019.4636614339. The cubic root of 256623216 is about 635.4752603845.

Adding to 256623216 its reverse (612326652), we get a palindrome (868949868).

The spelling of 256623216 in words is "two hundred fifty-six million, six hundred twenty-three thousand, two hundred sixteen".