216855552 has 88 divisors (see below), whose sum is σ = 586522816. Its totient is φ = 71221248.

The previous prime is 216855539. The next prime is 216855559. The reversal of 216855552 is 255558612.

It is a self number, because there is not a number n which added to its sum of digits gives 216855552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216855559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223773 + ... + 224739.

It is an arithmetic number, because the mean of its divisors is an integer number (6665032).

Almost surely, 2^216855552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216855552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293261408).

216855552 is an abundant number, since it is smaller than the sum of its proper divisors (369667264).

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

216855552 is an equidigital number, since it uses as much as digits as its factorization.

216855552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1045 counting only the distinct ones).

The product of its digits is 120000, while the sum is 39.

The square root of 216855552 is about 14726.0161618817. The cubic root of 216855552 is about 600.7911341638.

The spelling of 216855552 in words is "two hundred sixteen million, eight hundred fifty-five thousand, five hundred fifty-two".