216356636 has 12 divisors (see below), whose sum is σ = 379417920. Its totient is φ = 107951520.

The previous prime is 216356633. The next prime is 216356639. The reversal of 216356636 is 636653612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (216356633) and next prime (216356639).

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 216356636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216356633) 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, 54545 + ... + 58376.

It is an arithmetic number, because the mean of its divisors is an integer number (31618160).

Almost surely, 2^216356636 is an apocalyptic number.

It is an amenable number.

216356636 is a deficient number, since it is larger than the sum of its proper divisors (163061284).

216356636 is a wasteful number, since it uses less digits than its factorization.

216356636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113404 (or 113402 counting only the distinct ones).

The product of its digits is 116640, while the sum is 38.

The square root of 216356636 is about 14709.0664557612. The cubic root of 216356636 is about 600.3300369446.

The spelling of 216356636 in words is "two hundred sixteen million, three hundred fifty-six thousand, six hundred thirty-six".