216723330 has 64 divisors (see below), whose sum is σ = 583614720. Its totient is φ = 57224448.

The previous prime is 216723323. The next prime is 216723337. The reversal of 216723330 is 33327612.

It is an interprime number because it is at equal distance from previous prime (216723323) and next prime (216723337).

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

It is a junction number, because it is equal to n+sod(n) for n = 216723294 and 216723303.

It is not an unprimeable number, because it can be changed into a prime (216723337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23914 + ... + 31706.

It is an arithmetic number, because the mean of its divisors is an integer number (9118980).

Almost surely, 2^216723330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216723330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291807360).

216723330 is an abundant number, since it is smaller than the sum of its proper divisors (366891390).

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

216723330 is a wasteful number, since it uses less digits than its factorization.

216723330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7912 (or 7906 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 27.

The square root of 216723330 is about 14721.5260757844. The cubic root of 216723330 is about 600.6690037793.

The spelling of 216723330 in words is "two hundred sixteen million, seven hundred twenty-three thousand, three hundred thirty".