216456280 has 64 divisors (see below), whose sum is σ = 497664000. Its totient is φ = 84712320.

The previous prime is 216456269. The next prime is 216456283. The reversal of 216456280 is 82654612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216456283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564969 + ... + 565351.

It is an arithmetic number, because the mean of its divisors is an integer number (7776000).

Almost surely, 2^216456280 is an apocalyptic number.

216456280 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 216456280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248832000).

216456280 is an abundant number, since it is smaller than the sum of its proper divisors (281207720).

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

216456280 is a wasteful number, since it uses less digits than its factorization.

216456280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 216456280 is about 14712.4532284728. The cubic root of 216456280 is about 600.4221843458.

The spelling of 216456280 in words is "two hundred sixteen million, four hundred fifty-six thousand, two hundred eighty".