216849816 has 24 divisors (see below), whose sum is σ = 587301780. Its totient is φ = 72283248.

The previous prime is 216849803. The next prime is 216849823. The reversal of 216849816 is 618948612.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1505830 + ... + 1505973.

Almost surely, 2^216849816 is an apocalyptic number.

It is an amenable number.

216849816 is an abundant number, since it is smaller than the sum of its proper divisors (370451964).

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

216849816 is a wasteful number, since it uses less digits than its factorization.

216849816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3011815 (or 3011808 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 216849816 is about 14725.8214032359. The cubic root of 216849816 is about 600.7858369844.

It can be divided in two parts, 2168 and 49816, that added together give a square (51984 = 228²).

The spelling of 216849816 in words is "two hundred sixteen million, eight hundred forty-nine thousand, eight hundred sixteen".