216386730 has 96 divisors (see below), whose sum is σ = 660426624. Its totient is φ = 48117888.

The previous prime is 216386713. The next prime is 216386741. The reversal of 216386730 is 37683612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18669 + ... + 27951.

It is an arithmetic number, because the mean of its divisors is an integer number (6879444).

Almost surely, 2^216386730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216386730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330213312).

216386730 is an abundant number, since it is smaller than the sum of its proper divisors (444039894).

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

216386730 is a wasteful number, since it uses less digits than its factorization.

216386730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9340 (or 9337 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 216386730 is about 14710.0893946978. The cubic root of 216386730 is about 600.3578698395.

The spelling of 216386730 in words is "two hundred sixteen million, three hundred eighty-six thousand, seven hundred thirty".