216706730 has 32 divisors (see below), whose sum is σ = 403779600. Its totient is φ = 83681280.

The previous prime is 216706727. The next prime is 216706733. The reversal of 216706730 is 37607612.

It is an interprime number because it is at equal distance from previous prime (216706727) and next prime (216706733).

It can be written as a sum of positive squares in 8 ways, for example, as 6775609 + 209931121 = 2603^2 + 14489^2 .

It is a super-3 number, since 3×216706730³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (216706733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37046 + ... + 42494.

Almost surely, 2^216706730 is an apocalyptic number.

216706730 is a deficient number, since it is larger than the sum of its proper divisors (187072870).

216706730 is a wasteful number, since it uses less digits than its factorization.

216706730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5594.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 216706730 is about 14720.9622647434. The cubic root of 216706730 is about 600.6536672363.

The spelling of 216706730 in words is "two hundred sixteen million, seven hundred six thousand, seven hundred thirty".