216256356 has 36 divisors (see below), whose sum is σ = 549440892. Its totient is φ = 71717184.

The previous prime is 216256321. The next prime is 216256367. The reversal of 216256356 is 653652612.

It is a happy number.

216256356 is a `hidden beast` number, since 2 + 16 + 2 + 5 + 635 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 119902500 + 96353856 = 10950^2 + 9816^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 216256356.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8155 + ... + 22338.

It is an arithmetic number, because the mean of its divisors is an integer number (15262247).

Almost surely, 2^216256356 is an apocalyptic number.

It is an amenable number.

216256356 is an abundant number, since it is smaller than the sum of its proper divisors (333184536).

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

216256356 is a wasteful number, since it uses less digits than its factorization.

216256356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30700 (or 30695 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 216256356 is about 14705.6572787482. The cubic root of 216256356 is about 600.2372728236.

It can be divided in two parts, 216256 and 356, that added together give a palindrome (216612).

The spelling of 216256356 in words is "two hundred sixteen million, two hundred fifty-six thousand, three hundred fifty-six".