215816730 has 64 divisors (see below), whose sum is σ = 539827200. Its totient is φ = 55157760.

The previous prime is 215816707. The next prime is 215816737. The reversal of 215816730 is 37618512.

215816730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 215816691 and 215816700.

It is not an unprimeable number, because it can be changed into a prime (215816737) 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, 100306 + ... + 102434.

It is an arithmetic number, because the mean of its divisors is an integer number (8434800).

Almost surely, 2^215816730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215816730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269913600).

215816730 is an abundant number, since it is smaller than the sum of its proper divisors (324010470).

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

215816730 is a wasteful number, since it uses less digits than its factorization.

215816730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 215816730 is about 14690.7021615714. The cubic root of 215816730 is about 599.8302575392.

The spelling of 215816730 in words is "two hundred fifteen million, eight hundred sixteen thousand, seven hundred thirty".