213440256 has 54 divisors (see below), whose sum is σ = 615407520. Its totient is φ = 71145984.

The previous prime is 213440231. The next prime is 213440257. The reversal of 213440256 is 652044312.

213440256 is a `hidden beast` number, since 213 + 440 + 2 + 5 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213440257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44016 + ... + 48623.

Almost surely, 2^213440256 is an apocalyptic number.

It is an amenable number.

213440256 is an abundant number, since it is smaller than the sum of its proper divisors (401967264).

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

213440256 is an equidigital number, since it uses as much as digits as its factorization.

213440256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92661 (or 92644 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 213440256 is about 14609.5946555680. The cubic root of 213440256 is about 597.6204419818.

Adding to 213440256 its reverse (652044312), we get a palindrome (865484568).

The spelling of 213440256 in words is "two hundred thirteen million, four hundred forty thousand, two hundred fifty-six".