216284478 has 8 divisors (see below), whose sum is σ = 432568968. Its totient is φ = 72094824.

The previous prime is 216284413. The next prime is 216284491. The reversal of 216284478 is 874482612.

216284478 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

216284478 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18023701 + ... + 18023712.

It is an arithmetic number, because the mean of its divisors is an integer number (54071121).

Almost surely, 2^216284478 is an apocalyptic number.

216284478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216284478 is a wasteful number, since it uses less digits than its factorization.

216284478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36047418.

The product of its digits is 172032, while the sum is 42.

The square root of 216284478 is about 14706.6134102995. The cubic root of 216284478 is about 600.2632900026.

It can be divided in two parts, 21628 and 4478, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 216284478 in words is "two hundred sixteen million, two hundred eighty-four thousand, four hundred seventy-eight".