215516730 has 96 divisors (see below), whose sum is σ = 612404352. Its totient is φ = 48216960.

The previous prime is 215516699. The next prime is 215516759. The reversal of 215516730 is 37615512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44907 + ... + 49473.

It is an arithmetic number, because the mean of its divisors is an integer number (6379212).

Almost surely, 2^215516730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215516730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306202176).

215516730 is an abundant number, since it is smaller than the sum of its proper divisors (396887622).

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

215516730 is a wasteful number, since it uses less digits than its factorization.

215516730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612 (or 4601 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 215516730 is about 14680.4880709055. The cubic root of 215516730 is about 599.5521936434.

The spelling of 215516730 in words is "two hundred fifteen million, five hundred sixteen thousand, seven hundred thirty".