216570240 has 256 divisors, whose sum is σ = 781401600. Its totient is φ = 56678400.

The previous prime is 216570239. The next prime is 216570257. The reversal of 216570240 is 42075612.

216570240 is a `hidden beast` number, since 2 + 1 + 657 + 0 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1434165 + ... + 1434315.

It is an arithmetic number, because the mean of its divisors is an integer number (3052350).

Almost surely, 2^216570240 is an apocalyptic number.

216570240 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 216570240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390700800).

216570240 is an abundant number, since it is smaller than the sum of its proper divisors (564831360).

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

216570240 is a wasteful number, since it uses less digits than its factorization.

216570240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 216570240 is about 14716.3256283625. The cubic root of 216570240 is about 600.5275360403.

The spelling of 216570240 in words is "two hundred sixteen million, five hundred seventy thousand, two hundred forty".