216508930 has 24 divisors (see below), whose sum is σ = 428367996. Its totient is φ = 78730080.

The previous prime is 216508927. The next prime is 216508939. The reversal of 216508930 is 39805612.

It can be written as a sum of positive squares in 2 ways, for example, as 195468361 + 21040569 = 13981^2 + 4587^2 .

It is a super-2 number, since 2×216508930² = 93752233539489800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216508939) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 88257 + ... + 90676.

Almost surely, 2^216508930 is an apocalyptic number.

216508930 is a deficient number, since it is larger than the sum of its proper divisors (211859066).

216508930 is a wasteful number, since it uses less digits than its factorization.

216508930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178962 (or 178951 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 216508930 is about 14714.2424201860. The cubic root of 216508930 is about 600.4708618667.

The spelling of 216508930 in words is "two hundred sixteen million, five hundred eight thousand, nine hundred thirty".