216436356 has 18 divisors (see below), whose sum is σ = 547103102. Its totient is φ = 72145440.

The previous prime is 216436351. The next prime is 216436369. The reversal of 216436356 is 653634612.

216436356 is a `hidden beast` number, since 2 + 1 + 643 + 6 + 3 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 175986756 + 40449600 = 13266^2 + 6360^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 6012121 = 216436356 / (2 + 1 + 6 + 4 + 3 + 6 + 3 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 216436356.

It is not an unprimeable number, because it can be changed into a prime (216436351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3006025 + ... + 3006096.

Almost surely, 2^216436356 is an apocalyptic number.

It is an amenable number.

216436356 is an abundant number, since it is smaller than the sum of its proper divisors (330666746).

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

216436356 is a wasteful number, since it uses less digits than its factorization.

216436356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6012131 (or 6012126 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 216436356 is about 14711.7760994382. The cubic root of 216436356 is about 600.4037615667.

The spelling of 216436356 in words is "two hundred sixteen million, four hundred thirty-six thousand, three hundred fifty-six".