216400284 has 36 divisors (see below), whose sum is σ = 570797136. Its totient is φ = 68996928.

The previous prime is 216400273. The next prime is 216400313. The reversal of 216400284 is 482004612.

It is a tau number, because it is divible by the number of its divisors (36).

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129849 + ... + 131504.

It is an arithmetic number, because the mean of its divisors is an integer number (15855476).

Almost surely, 2^216400284 is an apocalyptic number.

It is an amenable number.

216400284 is an abundant number, since it is smaller than the sum of its proper divisors (354396852).

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

216400284 is a wasteful number, since it uses less digits than its factorization.

216400284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261386 (or 261381 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 216400284 is about 14710.5500916859. The cubic root of 216400284 is about 600.3704046203.

Adding to 216400284 its reverse (482004612), we get a palindrome (698404896).

The spelling of 216400284 in words is "two hundred sixteen million, four hundred thousand, two hundred eighty-four".