216555000 has 80 divisors (see below), whose sum is σ = 676564680. Its totient is φ = 57744000.

The previous prime is 216554983. The next prime is 216555007. The reversal of 216555000 is 555612.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216555007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7782 + ... + 22218.

Almost surely, 2^216555000 is an apocalyptic number.

216555000 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 216555000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (338282340).

216555000 is an abundant number, since it is smaller than the sum of its proper divisors (460009680).

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

216555000 is a wasteful number, since it uses less digits than its factorization.

216555000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14466 (or 14447 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 216555000 is about 14715.8078269594. The cubic root of 216555000 is about 600.5134493798.

The spelling of 216555000 in words is "two hundred sixteen million, five hundred fifty-five thousand".