216864342 has 48 divisors (see below), whose sum is σ = 503165520. Its totient is φ = 67262976.

The previous prime is 216864341. The next prime is 216864367. The reversal of 216864342 is 243468612.

216864342 is a `hidden beast` number, since 2 + 1 + 6 + 8 + 643 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 216864297 and 216864306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216864341) 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, 23253 + ... + 31215.

It is an arithmetic number, because the mean of its divisors is an integer number (10482615).

Almost surely, 2^216864342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216864342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251582760).

216864342 is an abundant number, since it is smaller than the sum of its proper divisors (286301178).

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

216864342 is a wasteful number, since it uses less digits than its factorization.

216864342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8077 (or 8074 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 216864342 is about 14726.3146102479. The cubic root of 216864342 is about 600.7992515223.

The spelling of 216864342 in words is "two hundred sixteen million, eight hundred sixty-four thousand, three hundred forty-two".