216394560 has 168 divisors, whose sum is σ = 749844576. Its totient is φ = 57277440.

The previous prime is 216394543. The next prime is 216394567. The reversal of 216394560 is 65493612.

It is a happy number.

216394560 is a `hidden beast` number, since 2 + 1 + 6 + 3 + 94 + 560 = 666.

216394560 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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 (216394567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 653595 + ... + 653925.

Almost surely, 2^216394560 is an apocalyptic number.

216394560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216394560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374922288).

216394560 is an abundant number, since it is smaller than the sum of its proper divisors (533450016).

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

216394560 is a wasteful number, since it uses less digits than its factorization.

216394560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 216394560 is about 14710.3555361521. The cubic root of 216394560 is about 600.3651111114.

The spelling of 216394560 in words is "two hundred sixteen million, three hundred ninety-four thousand, five hundred sixty".