216280368 has 100 divisors (see below), whose sum is σ = 640700808. Its totient is φ = 70398720.

The previous prime is 216280357. The next prime is 216280369. The reversal of 216280368 is 863082612.

216280368 is a `hidden beast` number, since 2 + 16 + 280 + 368 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216280369) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 53788 + ... + 57668.

Almost surely, 2^216280368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216280368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320350404).

216280368 is an abundant number, since it is smaller than the sum of its proper divisors (424420440).

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

216280368 is a wasteful number, since it uses less digits than its factorization.

216280368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944 (or 3929 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 216280368 is about 14706.4736765820. The cubic root of 216280368 is about 600.2594877607.

The spelling of 216280368 in words is "two hundred sixteen million, two hundred eighty thousand, three hundred sixty-eight".