216840054 has 32 divisors (see below), whose sum is σ = 448966656. Its totient is φ = 69763680.

The previous prime is 216840023. The next prime is 216840061. The reversal of 216840054 is 450048612.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24349 + ... + 32039.

It is an arithmetic number, because the mean of its divisors is an integer number (14030208).

Almost surely, 2^216840054 is an apocalyptic number.

216840054 is an abundant number, since it is smaller than the sum of its proper divisors (232126602).

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

216840054 is a wasteful number, since it uses less digits than its factorization.

216840054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 216840054 is about 14725.4899409154. The cubic root of 216840054 is about 600.7768215908.

Adding to 216840054 its reverse (450048612), we get a palindrome (666888666).

The spelling of 216840054 in words is "two hundred sixteen million, eight hundred forty thousand, fifty-four".